INDEX TO VOL. XX. 
eee 
A 
Axison (WILLIAM Putteney), M.D. Defence of the doctrine of vital affinity, 385. Observations 
on the speculations of Dr Brown and other recent metaphysicians, regarding the exercise of the 
senses, 513. 
Anverrson (Tuomas), M.D. On the constitution of codeine and its products of decomposition, 57. 
On the products of the destructive distillation of animal substances, 247. Researches on some 
of the crystalline constituents of opium, 347. 
Animal Substances, on the products of the destructive distillation of, 247. 
Aqueous Vapour which is condensed on a cold surface, on the weight of, 299. 
B 
Barometer. On a necessary correction to the observed height of the barometer, depending upon the 
force of the wind, 377. 
Brewster (Sir Davin). On the optical phenomena and crystallisation of tourmaline, titanium, and 
quartz, within mica, amethyst, and topaz, 547. On the production of crystalline structure in 
crystallised powders, by compression and traction, 555. On circular crystals, 607. 
Bust, notice of an antique marble, 417. 
C 
Caprice Acid, on a new source of obtaining, and remarks on some of its salts, 219. 
Centrifugal Theory of Elasticity, and its connection with the theory of heat, 425. 
Charr (Salmo umbla), some observations on the, relating chiefly to its generation and early stage of 
life, 321. 
Codeine and its products of Decomposition, on the constitution of, 57. 
Comenic Acid, on certain salts and products of decomposition of, 225. 
Cometary Physics, some remarks on the theories of, 131. 
Comvound Series, summation of a, and its application to a problem in probabilities, 541. 
Coventry (AnprEw). Notice of an antique marble bust, 417. 
Crystalline Constituents of Opium, researches on some of the, 347. 
Crystalline Structure, on the production of, in crystallised powders, by compression and traction, 555. 
Crystallised Powders, on the production of crystalline structure in, by compression and traction, 555. 
Circular Crystals, 607. 
D 
Datmanoy (Jamzs). On the weight of aqueous vapour which is condensed on a cold surface, under 
given conditions, 299. 
Davy (Jouy), M.D. Some observations on the charr (Salmo wmbia), relating chiefly to its generation 
and early stage of life, 321. Some observations on fish, in relation to diet, 599. 
Differential Calculus, on a process in the, 39. 
Dynamical Theory of Heat, on the, 261. 
Dynanical Equivalent of Temperature in Liquid Water, and the specific heat of atmospheric air and 
steam, 191. 
VOL. XX. PART IV. 8s 
