INDEX. 419 
O 
Observatory of Dorpat, 391- . „ 
Opal, speculations regarding its formation, 103 — Hornstone, on its for- 
mation, 164. 
Optical system of mineralogy defended, 36l. 
Orhithorynclms Paradoxus , on the anatomy of the, 37T« 
Ornithology , Swedish, 407* 
Oscillation of sonorous chords, 395. 
P 
Palladium , experiments on, 404. 
Varamaita , position of, 391- 
Paranthine identical with Wernerite, 393. 
Patents, list of, granted in Scotland, 208, 413. 
Pearson, The Rev. Dr, his Introduction to Practical Astronomy, 392. 
Pendulum Doid)ler of electricity, a new one described, 322, 
Percussion, on the magnetism produced by it, 45. 
Perkins, Mr, his new steam-engine described, 177* — nis method of ap- 
plying the new principle to old steam-engines, 177* 328. — on the 
crystallisation of acetic acid by pressing, 401. — on the effects of 
pressure on atmospheric air, 401. 
Persulphate of iron arid ammonia, 401. • 
Phillips, Mr R., his analysis of Uranite, 1°Q. 
Phosphorescence of the chara vulgaris and hispida, 194. 
Petrifactions, observations on, 20. 
Plants, on five new genera of, 259? 
Plumbago, on the fusion of, 1.79# 
Polarisation of sound, 394. 
Population of the cities of Hindostan, 206.— of the United States, 207- 
of Rome in 1821 and 1822, 207* 
Porto Santo, on the geognosy of, 315. 
Preparations, method of preserving, 205, 
Pristanopsky’s work on Tuscany, 200. 
Proceedings of the Royal Society of Edinburgh, 185. — of the Werne- 
rian Natural History Society, 1 8 7^ 389. — of the Society of Arts 
for Scotland, 1 89. 
R 
Rain, quantity of, in America, 397- 
Refraction, double, account of discoveries respecting it, 148. 
Refractive and dispersive power of different kinds of glass, 288. 
Reptiles, foramen centrale in the eyes or, discovered by Dr Knox, 35S 
Richardson, Dr, on the geognostical structure of the country front'. 
Hudson’s Bay to the Polar Sea, 372. 
RipeVs work on the structure of the Alps, 200. 
Rome, population of, for 1821 and 1822, 207* 
Ronald’s pendulum doubler of electricity, 322. — his improvement ov 
the electrical machine, 395. 
Royal Society of Edinburgh, proceedings of, 185. 
Ruscojii, Dr, on the aquatic salamander, 113. 
. S 
Salamander , aquatic, Dr Rusconi’s observations on the, 112, 
Salt- Springs, probable origin of, 409* 
