Proceedings of the American Academy of Arts and Sciences, Volumen20Metcalf and Company, 1885 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
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Página 165
... † The crystallization from ligroine , as recommended by Immendorff , is far superior to the crystallization from hot alcohol , used by Menke and me . used up , the crude borneol is precipitated by water OF ARTS AND SCIENCES . 165.
... † The crystallization from ligroine , as recommended by Immendorff , is far superior to the crystallization from hot alcohol , used by Menke and me . used up , the crude borneol is precipitated by water OF ARTS AND SCIENCES . 165.
Página 166
American Academy of Arts and Sciences. used up , the crude borneol is precipitated by water , washed till free from alkali , dried by pressure between cloth or filter - paper , and puri- fied by crystallization from ligroine . Finally ...
American Academy of Arts and Sciences. used up , the crude borneol is precipitated by water , washed till free from alkali , dried by pressure between cloth or filter - paper , and puri- fied by crystallization from ligroine . Finally ...
Página 390
... precipitate into parts by the action of appropriate solvents , are many . When a complete solution is the object , and the precipitate yields easily to solvents which do not affect paper injuriously , the use of the ordinary filter ...
... precipitate into parts by the action of appropriate solvents , are many . When a complete solution is the object , and the precipitate yields easily to solvents which do not affect paper injuriously , the use of the ordinary filter ...
Página 391
... precipitate , should dissolve easily in solvents which do not affect the ordinary precipitates met with in analysis . The material which seems best suited to the case light and fluffy , capable of making secure filters of any desirable ...
... precipitate , should dissolve easily in solvents which do not affect the ordinary precipitates met with in analysis . The material which seems best suited to the case light and fluffy , capable of making secure filters of any desirable ...
Página 392
... precipitate which stays behind being washed first with a solvent of anthracene , and then , if necessary , with alcohol followed by water ; or , if the vacuum filter be used ( either paper or asbestos , ac- cording to the circumstances ...
... precipitate which stays behind being washed first with a solvent of anthracene , and then , if necessary , with alcohol followed by water ; or , if the vacuum filter be used ( either paper or asbestos , ac- cording to the circumstances ...
Otras ediciones - Ver todas
Términos y frases comunes
Abdomen abdominal appendages Acad acetic acetic acid acid acute Antennæ appears areola Astacus Barrande base Bentham blastodisc border Boston bracts branches broad California calyce calyx Cambarus Cambridge carapace cells Cephalothorax cervical groove chela ciliate cleavage cleavage-plane collected corolla difference of potential Dikelocephalus dorsal Emmons entoderm Eritrichium faune feet flowers foliis fossils fruit genera genus glabrous Graptolites Gray gynobasi Hagen inches long lateral leaflets leaves length Lévis limestone lines long lobes longis Magn male margin maxillipeds median Mountains nearly nuclei Nuculæ nutlets observations Olenus ovum pair of legs papillæ Paradoxides pedicels periblast petioles plate Point Lévis posterior Potsdam precipitate Primordial fauna Proc pubescent punctate ring River rocks rostrum sæpius sandstone schists second fauna segment sepals short side Silurian slates slender somites species specimens spermogonia spines stars superficial tension surface Taconic system telson tion Trilobites tube upper ventral
Pasajes populares
Página 189 - On the Primordial Fauna and the Taconic System, by Joachim Barrande. With Additional Notes by Jules Marcou.
Página 497 - A surface of platinum of standard dimensions, raised to a standard temperature by a voltaic current, will always emit a constant light. A strip of that metal, one inch long and...
Página 423 - Experiment has shown that the surface energy between two media is a function not only of the temperature, but also of the difference of electrical potential across the surface.
Página 254 - as characterizing the ' Lower Silurian ' division, and which I have named Second fauna. It is then just to recognize this priority, and I think it all the more fitting to state it at this time, that it has not been claimed to this day.
Página 534 - with the great discovery of the quantification of the predicate," adds : — " I must continue to hold that the principle of quantification is explicitly stated by Mr. Bentham ; and it must be regarded as a remarkable fact in the history of logic, that Hamilton, while vindicating in 1847 his own claims to originality and priority as against the scheme of De Morgan, should have overlooked the much earlier and more closely related discoveries of Bentham.
Página 183 - In addition to the evidence heretofore possessed regarding the position of the shales containing the trilobites, I have the testimony of Sir WE Logan, that the shales of this locality are in the upper part of the Hudson River group, or forming a part of a series of strata which he is inclined to rank as a distinct group, above the Hudson River proper. It would be quite superfluous for me to add one word in support of the opinion of the most able stratigraphical geologist of the American continent.
Página 346 - Stems often tall (6 or 8 feet high, or less), with mostly rather slender straight or recurved spines, often scattered, or wanting : stipules and rhachis as in the last ; leaflets 5 or 7 (very rarely 9), oblong to oblong-obovate, more or less cuneate at base and often petiolulate, usually glaucous, very finely pubescent beneath or glabrous or somewhat resinous, the teeth usually simple : flowers small, often solitary, the short pedicels, receptacles, and sepals glabrous, or the last subpubescent :...
Página 446 - This mode of treatment appears to remove the last traces of alumina, and yields a reasonably good separation. It appears, therefore, to recapitulate, that for the separation of titanium and aluminum either of the processes set forth in the preceding work may serve. The first, however, which is, in brief, the treatment of the solution containing salts of the elements in question with a mixture of microcosmic salt and formic acid, in the proportion of two to three by weight, together with enough ammonic...
Página 501 - One observer tested the light photometrically, whilst another observed the galvanometer, with the result that with similar photometric observations the thermopile indicated a large change in the amount of heat received. In conclusion the Author thinks it possible to assume as a practical standard, a carbon loop in an exhausted vessel raised to such a point of incandescence that it will radiate a definite amount of energy, this energy being measured by a bolometer strip or the thermopile at a definite...
Página 447 - ... filtrates, — always undesirable, — and that process which involves the precipitation of iron by ammonic sulphide in presence of ammonic tartrate to hold up the hydrates which would be precipitated in its absence. This latter method has been regarded as an undesirable one chiefly on account...