INDEX 
Proteus , Mexican, Sir E. Home on its organs of generation ; see 
axolotl — from Germany and Carolina, perfect animals, not 
larvas, 4i9— distinguished from other animals by having 
cupped vertebras, 419- 
Prout, W„, M. D. F. R. S. on the nature of acid and saline mat- 
ters usually found in the stomachs of animals, 45. 
Pylorus of walrus, 235. 
Q 
Quiescence , point of, in magnetization of steel, 21 6. 
R 
Radiation of mercurial molecules from the poles of an electrified 
globule. 
Rates, of chronometers, effect of density of air on, 372 — affected 
by magnetism, 273. 
Ray, his opinion respecting the cause of migration in birds, 23. 
Redstart , migration of, 29- 
Redwing, never breeds in England, 32 — its food, insects, 33. 
Refraction, a finite expression for, in an atmosphere resembling 
the earth’s, 159 — constants of, used by Bessel and Pond, 54™ 
Bessel’s investigation of, 58 — Brinkley’s mode of investi- 
gation, 59- 
— solar , anomalies in, at summer and winter solstices, 62. 
horizontal, represented to 1" 5 by Dr. Young’s expres- 
sion, 161. 
Retina, its lateral portions more sensible in some cases to very 
faint lights than its central ones, Part iii. 16. 
Revulsions in the motion of mercury electrified under conduct- 
ing media, 175 — explained, 176, 177. 
Richardson, Mr. called in to decide doubts in measures of 
double stars, iii. 16. 
Rigel, remarkable coincidence in the means of numerous sets of 
observations of, iii. 76. 
Rings seen about the stars, iii. 14 — how obliterated, ibid. 
Robin, the first bird which sings in the morning, 37. 
Rose, his drawings of the placenta and biliary ducts of the 
seal, Plates V, VI, VII, VIII. 
S 
Sabine, Capt. E., R. N. comparison of barometrical and trigo- 
nometrical measures of a height in Spitzbergen by, 290. 
mdcccxxiv. d 
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