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(LIMITED),
23 ABINGDON STREET, WESTMINSTER, S.W.

AND

12 BOULEVARD ST. MARTIN, PARIS. Managing Director and Secretary, Mr. WOODCOCK.

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Churches, Greenhouses, Offices, and Buildings of every description, warmed by means of a modification of the plan successfully used by Sir Goldsworthy Gurney in both Houses of Parliament. Extracts from Reports on Paris Unitersal Exhibition.

TESTING HOUSES, Vol. IV., page 83. * These figures shew that the Gurney Company Stove gave out rather more than nine-tenths of the heat due to the combustion of a given quantity of coke, whereas some others gave scarcely half of that quantity.'

The cost is less and the effect greater than that of any other known plans.

The apparatus may be seen at work in the Houses of Parliament, the Offices of the Department of Science and Art, in St. Paul's, York Minster, and 13 other Cathedrals, besides 1,000 Churches in England, and Govern. ment and other Public and Private Buildings too nune. rous to name in an advertisement.

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Particulars and Testimonials forwarded on application,

SOLAR CAMERA
FOR PHOTOGRAPHING THE SOLAR DISK SPOTS gc.

WITH INSTANTANEOUS SLIDES. Adapted for use with either Reflectors or Refractors of from 3 in. to 6 in. in aperture. By means of this contrivance Photographs may be taken either the size of the focal image giren by the Object-glass, or magnified by means of one of the eye-pieces of the Telescope from 5 to 10 diameters. Price £6 6s.

JOHN BROWNING,
Optical and Physical Instrument Maker to the Royal Observatory, &c. &c.

111 MINORIES, LONDON, E. PRIZE MEDAL 1862.]

[ESTABLISHED 100 YEARS.

NEW SOLAR EYE-PIECE.

This contrivance, proposed by Professor Pickering, is the most efficient yet made: the greater portion of the Sun's rays are allowed to pass away in a direct line with the tube of the Telescope. The small amount of light reflected is polarised, and the quantity of light received by the eye can be regulated by turning an analysing prism which is placed over the eye-piece.

Price for Telescopes up to 6 in. diameter, £5; above 6 in. diameter, £10.

JOHN BROWNING,
Optical and Physical Instrument Maker to the Royal Observatory, &c. &c.

111 MINORIES, LONDON, E. PRIZE MEDAL 1862.]

[ESTABLISHED 100 YEARS.

CONTENTS.—No. XL.

PAGE THE STRUCTURE OF Rock MASSES (FOLIATION AND STRIATION).

By David Forbes, F.R.S. Plate LXXIII. ... ... ... ... 229 BRITISH BEARS AND WOLVES. By W. Boyd Dawkins, M.A., F.R.S.,

F.G.S. ... ... ... ... ... ... ... ... ... 241 THE “Lotos” OF THE ANCIENTS. By M. C. Cooke, M.A. Plate

LXXIV.... ... ... ... ... ... ... ... ... 254 GREENLAND. By William Pengelly, F.R.S., F.G.S. ... ... ... 267

REVIEWS:

The Descent of Man—The Beginning—Popular Astronomy-A Meteorological Text Book—The Sub-Tropical Garden-A Manual of Colour—British Butterflies—Cassell's Technical Educator-Fragments of Science ... ... ... ... ... ... ... ... ...

292

SCIENTIFIC SUMMARY:-.

Astronomy - Botany-Chemistry -- Geology and PalæontologyMechanical Science-Medical—Microscopy–Physics—Zoology and Comparative Anatomy ... ... ... ... ... ... ... 305

No notice can be taken of anonymous contributions. Contributors must write their names and addresses on the first page of MS. If accompanied with stamps, unsuitable manuscripts will always be carefully returned.

The Editor does not hold himself identified with the opinions expressed in contributions.

All communications to the Editor are to be addressed to 192 Piccadilly.

Articles in the POPULAR SCIENCE REVIEW are Copyright, and the Right of

Translation is Reserved.

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Tais Lamp is offered to Microscopists as thoroughly efficient, and yet very moderate in price. It embraces all the latest improvements, and is furnished with Haile's Porcelain Shade, which, while shielding the observer's eyes from the glare of the Lamp, acts as a reflector to increase the brilliancy of the illumination. The glass reservoir is shallow, so that the paraffin rises freely and feeds the wick regularly. The reservoir rotates in the arm B, so that the flat or edge side of the flame can be used. The shade can be adjusted to a proper position as regards the flame by sliding up or down the arm D, and the Lamp fixed at any required height by the clamping screw C. As the tube E carries the tube D, when the Lamp and shade are properly adjusted the whole may be raised or depressed without deranging that adjustment by sliding up or down the arm B. The brass wickmount is hinged, so that the gallery or chimney can be turned back to facilitate turning and lighting.

Price 108. Polished Case for ditto, 38.

A. CADMAN

BARKER'S IMMERSION PARABOLA, For dark ground illumination, with high powers, giving effects hitherto

unattainable. Price £1 11s. 6d.

ACKLAND'S NEUTRAL TINT SELENITE STAGE.

This neutral tint is exceedingly delicate in action, as its colour is varied by the slightest depolarising influence of the object under examination, and will be found to give a display of colours to objects (requiring the use of the Selenite) more varied and gorgeous than can be obtained by any of the usual colours employed, and at the same time the mere rotation of one or other of the films will give a succession of nearly all the prismatic colours, so that the observer, if dissatisfied with the neutral tint, can produce and test a multiplicity of others, and note the effect of each with the special object under examination. Price 158. or with an extra film, so as to produce the entire series

of Prismatic Tints, 188. éd. Illustrated Catalogue of Microscopes and accessories sent on receipt of Two Stamps.

MANUFACTURED BY HORNE & THORNTHWAITE,

122 & 123 NEWGATE STREET, LONDON, E.C.

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