334 
INDEX. 
H. 
Hearing, on the organ of, in Crustacea, 233. 
Herschel (Sir John F. W., Bart., K.H.). On certain improvements on photographic processes 
described in a former communication, and on the parathermic rays of the solar spectrum, 1 . 
Hoskins (S. Elliott, M.D.). Researches on the decomposition and disintegration of phosphatic 
vesical calculi, and on the introduction of chemical decomponents into the living bladder, 7. 
I. 
Ipswich, on the laws of the tides at, 51. 
Ivory, remarkable in its electric condition, 23, 31. 
L. 
Leaves of plants, on the respiration of the, 329. 
Light, elliptic polarization of, by reflexion, on certain cases of, 35. 
M. 
Magnetic Declination, observations of, made on board Her Majesty’s Ship Erebus, between 
November 15, 1840, and April 6, 1841, 177. 
, observations of, made on board Her Majesty’s Ship Terror, between 
November 15, 1840, and April 5, 1841, 217. 
, general table of, observed on board Her Majesty’s Ships Erebus and 
Terror, between November 1840, and April 1, 1841, 227. 
Magnetic Inclination, observations of the, made on board Her Majesty’s Ship Erebus on her pass- 
age from Kerguelen Island to Van Diemen Island, 175; observations from September 1840 
to April 1841, 193. 
, general table of, observed on board Her Majesty’s Ship Erebus, from June 
1840 to April 1841, 229. 
Magnetic Intensity, observations of the, made on board Her Majesty’s Ship Erebus on her pass- 
age from Kerguelen Island to Van Diemen Island, 176 ; observations from September 1840 
to April 1841, 208. 
, general table of the, from observations made on board Her Majesty’s Ship 
Erebus, between July 1840, and April 1841, 231. 
Magnetic Determinations , general table of Captain Sir Edw'ard Belcher’s, 140. 
Magnetism, Terrestrial, contributions to. No. IV. Second series of magnetic determinations by 
Captain Sir Edward Belcher, R.N., 113. 
, contributions to. No. V. 1. Observations within the Antarctic Circle, 
made on board Her Majesty’s Ships Erebus and Terror, in the summer of 1840, 1841, in the 
expedition under the command of Captain James Clark Ross, R.N., 145. 2. Observations 
between Kerguelen Island and Van Diemen Island, made on board Her Majesty’s Ship 
Erebus, July and August 1840, 173. 
Myriapoda and Macrourous Arachnida, on the structure, relations and development of the ner- 
vous and circulatory systems, and on the existence of a complete circulation of the blood in 
vessels, in. First series, 243. 1. Nervous system. — Theory of development, ibid. Struc- 
ture, 245. Functions of the brain and nervous cord, 264. 2. The circulatory system, 272. 
Structure, 274. The supra-spinal artery, 282. Circulatory system in Arachnida. — 1 he 
