INDEX. 
Home, Sir Everard, Bart. On the effects produced upon the air- 
cells of the lungs when the pulmonary circulation is too much 
encreased, p. 301. 
Hydrosulphuret of soda, true composition of, p. 168. 
Hyposulphite of soda, composition of, p. 169. 
HyposidpJmrous acid, true composition of, p. 169. 
I 
Index of refraction and curvature of the surfaces of any given 
convex or concave lens, method of practically determining, 
p. 264. 
Iron, perchromates of, p, 218. 
L 
Lead, bichromate of, p. 221. 
Lignin, from box~ioood and willow, composition of, p. 380. 
Lungs, air-cells of the, effects produced on them, when the pul¬ 
monary circulation is too much encreased, p. 301. 
Lungs, human, examination into the structure of the cells of, with 
a view to ascertain the office they perform in respiration, p. 58. 
M 
Machine moved by Recoil, investigation of, p. 27. 
Magnesia, potash-chromate of, p. 224. 
Magnetic bodies, on the mutual action of the particles of, during 
rotation, p. 74. 
Magnetic forces generated at different distances during rotation, on 
the law of the variation of, p. 92. 
Magnetic intensities at Port-Bowen, Addenda to Table of, in Phil. 
Trans, for 1826, p. 125. 
Magnetic needle, theory of diurnal variation of, illustrated by expe¬ 
riments, p. 308. 
—--— observations, table of means deduced from Canton’s, 
p. 333. 
-- observations at Fort Enterprise, by Lieutenant Hood, 
mentioned, p. 337. 
.. observations in London, variation 19 W^. mentioned, 
p. 338. ^ 
-- —observations near London, variation 24°36'W. menti¬ 
oned, p. 339. 
