INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS 
FOR THE YEAR 1842. 
A. 
Actinometer, Herschel’s, 231. Comparison of actinometers used in observations at Brientz and 
at the Faulhorn, 243. Observations at Brientz, September 25, 1832, 248. At the Faulhorn, 
249. Miscellaneous observations in September 1832, 266. Observations on the Lower Aar 
glacier, 269. On the absolute values of the degrees of the actinometers employed, 272. 
Addison (William, Esq.). On the ultimate distribution of the air-passages, and the formation 
of the air-cells of the lungs, 157. 
Airy (George Biddell, Esq.). On the laws of the rise and fall of the tide in the river 
Thames, 1. 
Atmosphere, on the transparency of the, and the law of extinction of the solar rays in passing 
through it, 225. § I. Qualities of rays, ibid. § II. History of the inquiry, 226. § III. On 
the mass of atmospheric air traversed by rays with varying obliquities, 233. § IV. Account 
of the observations, 241. Comparison of actinometers, 243. § V. Analysis of the observa- 
tions of the 25th of September, 1832,251. § VI. Concerning the law of extinction, 257. 
§ VII. Other observations in 1832, 265. § VIII. Observations in 1841, 268. § IX. Con- 
clusions, 271. Additional notes, 272. 
Aurora Borealis, report of a remarkable appearance of the, below the clouds, 87. 
B. 
Bakerian Lecture, 225. 
Barry (Martin, M.D.). On fibre, 89. 
Blood, facts observed in the coagulation of the, 110. 
Blood-vessels, facts observed in the structure of, 104. 
Bowerbank (J. S., Esq.). On the organic tissues in the bony structure of the Corallidse, 215. 
Bowman (William, Esq.). On the structure and use of the Malpighian bodies of the kidney, 
with observations on the circulation through that gland, 57. 
C. 
Cheiranthus cheiri {Wall- flower). Photographic action on a solution of, spread on paper, 196. 
Chrysotype, a new photographic process, 206, 209. 
Colours of flowers, of the, in general under the action of the spectrum, 186. Of particular flowers, 
190. 
Colours, vegetable, on the action of the rays of the solar spectrum on, 181, 186, 190. Cases of 
negative photographic action on, 196. 
Corallidce, on the organic tissues in the bony structure of the, 215. 
Corchorus Japonica, action of the solar rays on a solution of the flowers, spread on paper, 190. 
Crystalline lens, facts observed in the formation and structure of the, 103. 
