INDEX 
Analysis — of the acid contents of the stomach, 47, &c.- Of air 
in the cavity of the chest in pneumato. thorax, 258, — of at- 
mospheric air by the platina ball, 273, — of gaseous mixtures 
in general by the platina sponge, 286. 
Anatomy, comparative, of the human brain, and that of insects, 
fishes, and worms, 1. 
— ■ — — — - of the axolotl and other protei, 419* 
Ariadne frigate, on the distribution of magnetism on board of 
her, 336. 
Astronomical refraction obtainable in finite terms on certain 
hypotheses of density and pressure, 159- 
— — — — instruments, preservation of from oxidation by 
zinc protectors, 240, — account of those used by Mr. Fallows, 
458, — ditto, of those used by Messrs. Herschel and South, 
Part iii. 4, 12 . 
Atmosphere, Bessel’s expression for its density, 58. See air, 
refraction. 
Attraction of bodies , general properties of, 86, 98, — of ellip- 
soids, general expression for, 132, 139- 
Atwood, his formula for the change in the rate of a chrono- 
meter by changes in arc of vibration, 410. 
Axolotl, Sir E. Home, on the organs of generation of, 419. Has 
cupped vertebiTe, 419, — a perfect animal, 419, — found in a 
lake near Mexico, — very abundant,— eaten by the peasantry, 
420, mode and parts of generation, 419, 420. Plates of, from 
M. Bauer’s drawings, Plates XXI, XXII, XXIII. 
B 
Bakerian Lecture, Mr. Herschel on motions in fluids caused 
by electricity, 162. 
Balls of platina and clay for analysis of gaseous mixtures, their 
best composition and mode of using, 268, Note. 
Barium, readily reduced from muriate of barytes by mercurial 
amalgamation, 181. 
communicates positive electro-mechanical properties 
to mercury, 181. 
Barometer , neutral point in, 296. — Comparisons of, by Captain 
Sabine, 297, 299, 304, -—remarkable depression of, in De- 
cember 1821, 398, — variations of approximate to uniformity 
as we ascend, 399 
Barometrical measurement of a height in Spitzbergen, compared 
