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"Evolution of Sound' Evolved" is a review of the article entitled The Nature of Sound," in "The Problem of Human Life," by Marcellus Thompson, professor of natural sciences in Garfield University, Wichita, Kan. To this work is appended an account of some original experiments in electricity which Professor Thompson conducted when a candidate for the master's degree at the University of Michigan. This work has been warmly received, as witness testimonials from John W. Langley, professor of general chemistry in the University of Michigan; Alfred Fairhurst, professor of natural sciences in Kentucky University; B. J. Radford, associate editor of the Christian Standard; John B. De Motte, professor of physics in DePauw University; O. P. Hay, professor of biology in Butler University; David S. Jordan, president of Indiana State University; A. E. Dolbear, professor of physics in Tufts College; C. Williams Parks, professor of physics in Rensselaer Polytechnic Institute.

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LETTERS TO THE EDITOR.

Correspondents are requested to be as brief as possible. The writer's name is in all cases required as proof of good faith.

The editor will be glad to publish any queries consonant with the character of the journal.

On request, twenty copies of the number containing his communication will be furnished free to any correspondent.

A Belated Dandelion.

THE day before Thanksgiving I found in full bloom a fine dandelion-head measuring one and one-half inches in diameter; yet the record of temperatures for the November just past shows a lower average than that of any November in Kansas since 1880. E. B. KNERR.

Atchison, Kan., Dec. 5.

Is Man Left-Legged?

LAST Sunday, while walking on the beach at Nahant, we tried :some experiments bearing on the subject. We found that, walking either forward or backward with the eyes shut, we bore to the right, but in running either forward or backward we bore to the left. This last fact surprised us somewhat at first; but we thought it might be explained from the fact that, the left leg being the stronger, there would be a stronger spring from the left foot in running, which would make the right leg take the longer step. We should be glad to hear if others have tried these experiments, whether with the same or different results.

FRED'K A. LOVEJOY. FRANCIS H. ALLEN.

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West Roxbury, Mass., Dec. 8.

INDUSTRIAL NOTES.

The Crocker-Wheeler Electric Motor.

THE Crocker-Wheeler Electric Motor Company of this city are now putting on the market a series of electric motors which show a considerable advance in design, construction, and efficiency. Two of their smaller motors are shown in the illustrations on this page. Fig. 1 shows a t-horse-power motor belted to a small threepiston suction and force pump, which is capable of lifting a thousand gallons of water per day a height of a hundred feet, and other quantities a correspondingly greater or less height. When desired, the motor is connected to the pump by toothed or friction gearing instead of by a belt.

By means of an automatic attachment to the ordinary float in the water-tank, the electric current is cut off from the motor when the tank is full, thus stopping the pump until enough water has been used from the tank to allow the float to fall, thus starting the motor and pump again by switching on the electric current. This cycle of operations being entirely automatic, the water-supply is never exhausted, and no more electric energy is absorbed than is just sufficient to pump enough water to supply the demand.

Fig. 2 shows one of the new Crocker-Wheeler arc motors with fan, and a regulator which effects any desired change in the speed and power of the machine by simply moving the armature out of

FIG. 2.- NEW C.-W. ELECTRIC FAN.

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this device the machines can be run either right-handed or lefthanded without taking apart or changing any connections. They are wound for every kind of circuit, and those of different windings are always compared to see if the same efficiency and proportion of ampère-turns are maintained. On the smallest size, about 2,500 ampère-turns are used to magnetize the field, the total loss in the machine due to resistance never being permitted to exceed about 47 watts.

Publications received at Editor's Office,

Dec. 2-7.

CHAPIN, F. H. Mountaineering in Colorado. Boston,
Appalachian Mountain Club. 168 p. 12°

CRAIG, T. A Treatise on Linear Differential Equations.
Vol. I. Equations with Uniform Coefficients. New
York, Wiley. 16 p. 8°. $5.
GANONG, W. F. The Economic Mollusca of Ac idia. St.
John, N B., Barnes & Co 116 p. 12. 50 cents.
NEW SOUTH WALES, Annual Report of the Department
of Mines, for the Year 1888. Sydney, Government.
245 P fo.

PHELPS. H. Practical Marine Surveying. New York,
Wiley. 217 P. 80. $2.50.
Skeleton Notes

P., RUSSELL, S. H

CKETTS, P. de Pie and Risse part II. Metallic Ele

ments. New York, Wiley. 52 p. 12. $1.50. THOMPSON, M. J. "Evolution of Sound evolved. Cincinnati, Standard Publ. Co. 190 p. 120. WOOD, A. Lessons in the Structure, Life, and Growth of Plants. Ed. by O. R. Willis. New York and Chicago, A. S. Barnes & Co. 220 p. 12°.

SCOTT'S
FMULSION

Of Pure Cod Liver Oil with
Hypophosphites

Of Lime and Scda.

There are emulsions and emulsions, and there is still much skimmed milk which masquerades as cream. Try as they will many manufacturers cannot 80 disguise their cod liver oil as to make it palatable to sensitive stomachs. Scott's Emulsion of PURE NORWEGIAN COD LIVER OIL, combined with Hypophosphites is almost as palatable as milk. For this reason as well as for the fact of the stimulating qualities of the Hypophosphites, Physicians frequently prescribe it in cases of

CONSUMPTION,

SCROFULA, BRONCHITIS and
CHRONIC COUGH or SEVERE COLD.
All Druggists sell it, but be sure you get
the genuine, as there are poor imitations.

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A New Method of Treating Disease.

HOSPITAL REMEDIES.

What are they? There is a new departure in the treatment of disease. It consists in the collection of the specifics used by noted specialists of Europe and America, and bringing them within the reach of all. For instance, the treatment pursued by special physicians who treat indigestion, stomach and liver troubles only, was obtained and prepared. The treatment of other physicians celebrated for curing catarrh was procured, and so on till these incomparable

cures now include disease of the lungs, kidneys,

female weakness, rheumatism and nervous debility.

This new method of "one remedy for one disease" must appeal to the common sense of all sufferers, many of whom have experienced

the ill effects, and thoroughly realize the absurdity of the claims of Patent Medicines which are guaranteed to cure every ill out of a single bottle, and the use of which, as statistics prove, has ruined more stomachs than alcohol. A circular describing these new remedies is sent free

Cree, lately a special student of chemistry in the Scientific Department of Rutgers College, desires a position as assistant in some chemical works. Address, B. G. D., 526 Cherry St., Elizabeth, N.J.

HEMIST. - A young man of twenty

EACHING.-A young man desires a posi

Ttion to teach the Natural Sciences, Botany

in particular, in a High or Normal School or Institute. Can also teach first Latin and German. Best of references given. Address "E," care of Science.

GNS UNIVERSITY desires a position as teacher of physical science. Specialty, chemistry, for which he refers to Prof. Remsen by permission. Address B. H. H., care of Science.

GRADUATE OF THE JOHNS HOP

Agists in America, especially in California,

ANTED.-To correspond with concholowith a view to exchange. Many British land, fresh water, and marine duplicates; some foreign. Address Mrs. FALLOON, Long Ashton Vicarage, Bristol, England.

on receipt of stamp to pay postage by Hospital TEA

Remedy Company, Toronto, Canada, sole pro-
prietors.

J. GRUNOW.

621 Sixth Avenue, New York.
Established 1852.

MAKER OF

Microscope Stands, Oil Immersion Objectives and Abbe Condensers for Bacterial and Histological work, of Objectives, Camera Lucida and other accessory apparatus.

Old and Rare Books.

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Any person seeking a position for which he is quali

fied by his scientific attainmen's, or any person seeking some one to fill a position of this character, be it that of a teacher of science, chemist, draughtsman, or what not, may have the Want' inserted under this head FREE OF COST, if he satisfies the pubiisher of the suitable character of his application. Any person seeking

EACHER OF NATURAL SCIENCE.A young lady desires a position as a teacher of Natural Sciences, especially Chemistry and Physics. One year's experience. Testimonials given. Address Miss J. S., No. 31, N. Hanover St, Carlisle, Pa.

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WA

ANTED a young man with some knowledge of mineralogy to assist in our Mineral Department. A. E. FOOTE, 1223 Belmont Av., Philada., Pa.

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HYSIOLOGY AND HYGIENE. - A Fellow of the Mass. Med. Society, Member of the Suffolk District Medical Society, and former Assistant Editor of The Annals of Physiology and Hygiene. Address "N," 47 Gynecology, desires a position as instructor in Lafayette Place, N.Y. City.

M of instruments of precision of experience

Prof. A. MELVILLE BELL'S WORKS information on any scientific question, the address of would be valued in connection with some higher

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Principles of Speech-Faults

ECHANICIAN.-An optician and maker
would be glad of a position where his skill
educational institution. Address G. J., care of
SCIENCE, 47 Lafayette Place, New York.
WILL ASSIST in photographic or optical Ice-teaching, physics, chemistry, and
'CIENCE-TEACHING.-A specialist in
laboratory in return for experience and con-

any scientific man, or who can in any way use this col-
umn for a purpose consonant with the nature of the
paper, is cordially invited to do so.

of Speech-Phonetics-Line venience of perfecting original appliances. Ad-physiography desires an engagement, preferably dress E. C. Owen, care of Gibson & Simpson, in a high or a normal school. Is well known as World English, 94 Adelaide Street East, Toronto, Canada. an author of several popular text-books. Address X., care of SCIENCE.

Writing

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etc.,

SUPPLIED BY

N. D. C. HODGES,

A

ANTED.-Information concerning the

N ANALYTICAL CHEMIST is open to an engagement in mining, metallurgy, handling of air from Caves, for Cool, calico-printing, and bleaching, or as research chemist in alkali manufacture. Addressing and ventilating rooms. Address "M. H." care of Science 47 Lafayette Place, N.Y.

47 Lafayette Place, N.Y. "Alkali," care of SCIENCE.

CALENDAR OF SOCIETIES. Anthropological Society, Washington. Dec. 3.- James Mooney, The Cherokee Ball Play; J. W. Powell, Remarks on American Archæology.

Natural Science Association, Staten

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Island.

Nov. 14. The following officers were elected for the ensuing year: president, Dr. N. L. Britton; recording secretary, Charles F. Simons; corresponding secretary, Arthur Hollick; treasurer, Eberhard Faber; curator, J. C. Thompson. Apple-blossoms were shown, picked during the week ending Nov. 16, and the fact was noted that pear-trees had blossomed so universally throughout the island during the past three months as almost to have ceased exciting attention. A horse-chestnut and a few branches of a silver-maple are in blossom near St. George at the present time, and Forsythia, Japan quince, Missouri currant, lilacs, and other garden shrubs, have blossomed more or less freely a second time. The growth of Protococcus has been extraordinary everywhere. It is unusually conspicuous on the trees and fences, and in New York many of the brownstone houses facing north appear as if they had received a coat of green paint. The almost constant wet weather since early summer was quoted as the probable cause of these phenomena.

Appalachian Mountain Club, Boston. Dec. 9.- The Rangeley Lake Camping Trip. Arrangements have been made for a winter trip to the Ravine House, Randolph, White Mountains. If the snow is in suitable condition, the party will go Dec. 26. It is probable, however, that the excursion will be Feb. 22-28. Members wishing further information are requested to send their names to the recording secretary, Rosewell B. Lawrence, 23 Court Street, Room 409, Boston, Mass.

American Academy of Arts and Sciences,

Boston.

Dec. 11.- S. C. Chandler, On the Lexell

Brooks Comet.

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following additional nominations were made:
for vice-president, S. B. Russell; for direc-
tor, F. H. Pond. Professor Nipher an-
nounced that Professor T. C. Mendenhall,

superintendent of the Coast Survey, would
visit St. Louis soon. It was ordered that the
president extend an invitation to Professor
Mendenhall to address the club on any sub-
ject that he might choose; also that the
club extend to Professor Mendenhall a ban-
quet while in St. Louis, and that a committee
of three be appointed to arrange for this
banquet. Mr. N. W. Perkins, jun., then
addressed the club on the subject of "Add-
ing-Machines." His paper treated particu-
larly of the invention of W. S. Burroughs of
St. Louis, one of which was shown. A full
description of the construction and operation
was given. Several parts of the machine
were also shown, and its powers were de-
monstrated by a practical test. The subject
was discussed by Messrs. Robert Moore, W.
W. Penney, Ed. Flad, George Burnet, J. A.
Seddon, and M. L. Holman. The machine
was specially intended for use in banks,
clearing-houses, etc. It appeared, however,
to be of limited use to engineers, whose work
requires but little computation of this kind.
Mr. Holman stated as his experience, that no
calculating-machine had yet been found to
be of real advantage to engineers, from the
fact that the problems considered were of so
varied a nature, and the number of times
which any given process had to be repeated,
in indentically the same manner, did not
justify the use of mechanical devices.

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receipt of stamp to pay postage, by A. H. Dix-
on & Son, 337 and 339 West King Street.
Toronto, Canada.-Christian Advocate.

Sufferers from Catarchal troubles should carefully read the above.

and

Exchanges.

[Free of charge to all, if of satisfactory character. York. Address N. D. C. Hodges, 47 Lafayette Place, New

to

dispose of. I wish also to obtain State or U.S. Reports
I would like to correspond with any person having
Tryon's Structural and Systematic Conchology"
on Geology, Conchology, and Archæology. I will ex-
change classified specimens or pay cash. Also wanted a
copy of MacFarlane's" Geologists' Traveling Hand-Book
and Geological Railway Guide." - D. E. Willard, Cura-
tor of Museum, Albion Academy, Albion, Wis.

Morris's "British Butterflies," Morris's "Nests and
Eggs of British Birds." Bree's "Birds of Europe" (all
colored plates), and other natural history, in exchange
for Shakesperiana; eithe: books, pamphlets, engravings,
or cuttings.-J. D. Barnett, Box 735, Stratford, Canada.
I have Anodonta opalina (Weatherby), and many
other species of shells from the noted Koshkonong Lake
and vicinity, also from Western New York, and fossils
from the Marcellus shale of New York, which I would be
glad to exchange for specimens of scientific value of any
ested in the collection, sale, or exchange of Indian relics.-
kind. I would also like to correspond with persons inter-
D. E. Willard, Albion Academy, Albion, Wis.
Will exchange "Princeton Review" for 1883, Hugh
Miller's works on geology and other scientific works, for
back numbers of The Auk," " American Naturalist,"
or other scientific periodicals or books. Write.-J. M.
Keck, Chardon, Ohio.

"I wish to exchange Lepidoptera with parties in the eastern and southern states. I will send western species for those found in other localities."-P. C. Truman, Volga, Brookings Co., Dakota.

Shells and curiosities for marine shells, curiosities or

minerals address W. F. Lerch, No. 308 East Fourth St., Davenport, Iowa.

A collection of fifty unclassified shells for the best offer in bird skins; also skins of California birds for those of birds of other localities. Address Th. E. Slevin, 2413 Sacramento St., San Francisco, Cal.

I have forty varieties of birds' eggs, side blown, first books, scientific journals, shells, and curios. class, in sets, with full data, which I will exchange for Write me, stating what you have to offer. - Dr. W. S. Strode, Bernadotte, Fulton County, Ill.

I want to correspond and exchange with a collector of beetles in Texas or Florida. Wm. D. Richardson, P.O. Box 223, Fredericksburg, Virginia. 100 botanical specimens and analyses for exchange. Send list of those desired and those which can be furnished, and receive a similar list in return. Also cabinet specimens and curiosities for the same. Scientific correSuondence solicited.-E. E. BOGUE, Orwell, Ashta. County, O.

I will sell to chapters or individual members of the Agassiz Association, 25 fine specimens of fossil plants from the Dakota group (cretaceous), correctly named, for $2.50. Send post-office order to Charles H. Sternberg (author "Young Fossil-Hunters "), 1033 Kentucky Street, Lawrence, Kan.

please write. I will offer about 30 specimens in exAny one who has a botanical box in good condition wil change.-C. B. Haskell, Box 826, Kennebunk, Me.

Lead, zinc, mundic, and calcite. - Lulu Hay, secre

tary Chapter 350, Carthage, Mo.

Drawings from nature -- animals, birds, insects, and plants to exchange for insects for cabinet; or I will send them in sets of ten each for ten cents in stamps. My drawings in botany are in detail, showing plant, leaves, flowers, seed, stamens, pistils, etc. - Alda M.

Sharp, Gladbrook, Io.

A few first-class mounted birds, for first-class birds' eggs of any kind in sets.-J. P. Babbitt, secretary Chapter 755. 10 Hodges Avenue, Taunton, Mass.

California onyx. for minerals and coins not in my collection.-W. C. Thompson, 612 East 141st Street, New

N.B. This treatment is not a snuff or an
Engineers' Club, St. Louis.
ointment; both have been discarded by repu-York, N.Y.
Dec. 4. Mr. Robert Moore submitted a table physicians as injurious. A pamphlet ex-
report from the standing committee on col-plaining this new treatment is sent free on
lection of local engineering data. The in-
formation furnished the committee was of
great and permanent value. Those contri-
buting were T. B. McMath, C. V. Merse-
reau, S. F. Burnet, T. J. Caldwell, R. E.
McMath, F. E. Nipher, J. A, Seddon, E. D.
Meier, and M. L. Holman. Some data on
fuels was in preparation by Professor Potter,
but had not been completed in time for this
report. It was ordered that the committee
be continued, and requested to present a
final report as soon as convenient. The
special committee on nominations of officers
for the coming year reported as follows: for
president, F. E. Nipher; vice-president,
George Burnet; secretary, W. H. Bryan;
THE AMERICAN SECULAR UNION offer a prize
treasurer, Charles W. Melcher; for directors, of ONE THOUSAND DOLLARS for the best essay,
E. D. Meier and S. B. Russell; librarian and Schools in instructing children in the purest prin-
treatise, or manual, to aid teachers in our Public
manager, J. B. Johnson; manager, J. A. ciples of morality without inculcating religious doc-
Seddon. The report was accepted, and there. For particulars apply to R. B. WESTBROOK,
PHILADELPHIA, Nov. 1889.

Whitall's Planispheres name
locate all Planets, Stars, Constellations,
visible any minute. Heliotellus, Luna-
tellus, Books, Telescopes, Stereopticons,
Slides, etc. Send for full list to Wm.
T. Cooper, M'g'r., P.O. Box 69, Wood-Houses,
bury, N.J.

One Thousand Dollar Prize!

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1707 Oxford St.

DO YOU INTEND TO BUILD?

We offer an Atlas of Sensible Low Cost a portfolio 11x14 inches, containing handsome illustrations, floor plans, and full descriptions of this popular design, and fifty-four others, ranging in cost from $800 to $7,200. This specimen design is for a cottage with seven rooms, has two large porches, and is a popular and practical working design, having been built several times for its estimated cost.

and costing $1,100. It combines beauty and comfort,

build, it will pay you to have this book.
No matter what style of a house you may intend to

We will send this Atlas, postpaid, on receipt of

price, $1.-N. D. C. Hodges, 47 Lafayette Place, New

York.

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THE

MAGIC LANTERNS. American Bell Telephone

Also Lime and Electric Light Apparatus, and mechanical, plain, and fine colored views.

J. B. COLT & CO., Manufacturers,
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250 HOUSEHOLD MICROSCOPE Sent to any address for $5.00

American Naturalist

Andover Review

Babyhood

Bradstreet's.

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This instrument is simply for use by a beginner in Microscopy. The finer Microscopes vary in value from $25. to $250. Send for catalogue to

G. S. WOOLMAN,
116 FULTON ST.,
NEW YORK.

Sold at Lowest Prices By Weight.

(For Chemical Manufacturers,) For Blowpipe Analysis, For Technical Purposes, Most varied and complete stock of fine cabinet specimens in U. S. Recent additions include fine Fluorite, Calcite, Barite. Specular Iron, etc., from England; Bertrandite, Phenacite, Descloizite, Brochantite, Vanadinite, Copper Pseudomorphs after Azurite, etc., from U. S. Send for complete catalogue free.

GEO. L. ENGLISH & CO, Dealers in Minerals, 1512 Chestnut St., Philadelphia, Pa.

E. & H. T ANTHONY & CO. 591 Broadway, N.Y. Manufacturers and Importers ot PHOTOGRAPHIC INSTRUMENTS, Apparatus and Supplies of every description. Sole proprietors of the Patent Detective, Fairy Novel, and Bicycle Cameras, and the Celebrated Stanley Dry Plates. Amateur Outfits in great variety, from $9.00 upward. Send for Catalogue or call and examine. 4.25 than 40 years established in this line of business.

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More

COMPANY.

95 MILK ST., BOSTON, MASS.

This Company owns the Letters Patent granted to Alexander Graham Bell, March 7th, 1876, No. 174,465, and January 30, 1877, No. 186,787.

The Transmission of Speech by all known forms of ELECTRIC SPEAKING TELEPHONES infringes the right secured to this Company by the above patents, and renders each individual user of telephones, not furnished by it or its licensees, responsible for such unlawful use, and all the quences thereof and liable to suit therefor.

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EVENING DRESS SILKS.

Brocaded and Metal Effects. Pompadour styles in Satin and Regence Grounds in special shades for Evening and Reception Wear. Colored Satins and Brocades for Street and House Wear.

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ESTERBROOK'S STEEL PENS.

OF SUPERIOR AND STANDARD QUALITY. Leading Nos.: 048, 14, 130, 135, 239, 333 For Sale by all Stationers.

THE ESTERBROOK STEEL PEN CO., Works Camden, N. J. 26 John St., New York.

44 In. Long.

PATENT WRENCH AND SCREW DRIVER COMBINED.

Turns Nuts, Gas Burners or Pipe without adjustment. Made of Best Polished Steel. Sent by mail for 25 cta. CHARLES U. ELY, P. O. Box 1945, New York City.

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THE

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H. Wunderlich & Co., GREATAMERICAN To Enjoy a Cup of Perfect

868 BROADWAY,

NEW YORK,

T

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Tea.

A TRIAL ORDER of 3%
pounds of Fine Tea, either Oolong, Ja-
pan, Imperial, Gunpowder, Young Hy-
son, Mixed, English Breakfast or Sun
Sun Chop, sent by mail on receipt of
$2.00. Be particular and state what kind
of Tea you want. Greatest inducement
ever offered to get orders for our cele-
lars address THE GREAT AMERICAN TEA CO.
P. O. Box 289.
31 and 33 Vesey St., New York.

Invite special attention to their latest brated Teas, Coffees and Baking Powder. For full particu

importations of Modern Etchings, Engravings, Brown's Carbon Photographs and Watercolor Paintings, also to their large collection of Rare English Mezzotints, Fancy Subjects by Bartolozzi, old Line Engravings, and Original Works by Rembrandt, Durer, and other old masters.

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FOOD
ADULTERATION

And its Detection. With photomicrographic plates and
a bibliographical appendix.
a bibliographical appendix. By J. P. Battershall. 328

pages, 8vo, cloth. Price, $3.50. Circulars and Catalogues

on application. E. & F. N. SPON,
12 Cortlandt St., New York.

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