INDEX. 
H 
Hawkins, C. Esq. his account of the distribution of the nerves 
connected with the organs of generation, 70 — of ganglia in 
fishes, 267. 
Heati animal, supposed influence of nerves and ganglia in pro- 
ducing, 257 — of the human uterus, 262 — its increase and dimi- 
nution not dependent on the action of the arteries, 26^:. 
, radiant, from terrestrial sources, Mr. Powell’s experiments 
on, 189 et seq . — distinguished into two portions, having different 
characters, 200. 
H ERscHEL, J. F. W, Esq. F. R. S., account of the repetition of 
M. Arago’s experiments on magnetism, 467. 
Home, Sir E. Bart. V. P. R. S. on the existence of nerves in the 
placenta, 56. 
on the influence of nerves and ganglia in pro- 
ducing animal heat, 257-268. 
on microscopical observations on the materials 
of the brain and ova, and the analogy between them, 436. 
on the changes in the ovum of the frog during 
the formation of the tadpole, 81. 
Horns of deer supplied with nerves, 67 — their temperature, 259 — 
of fossil elk found in peat mosses in Ireland and the Isle of Man. 
See Elk. 
Hydrogen and carbon, new compounds of, described, 140. See 
Carbon — bicarburet of, 443 — new carburet of, having the same 
proportion of its elements as olefiant gas, 452. 
I 
Iguanodon, Mr. Mantell’s account of its fossil remains, 179 — 
Baron Cuvier’s observations on its teeth, 181. 
Imaqination of the mother, its influence on the child instanced, 75, 
76, 77, 78. 
Intensity of magnetism in a magnet increased by cold, 62 — dimi- 
nishes rapidly by an increase of temperature from 80° F. upwards, 
63 — partially destroyed by a temperature above 100° F. ib. — in 
soft iron increases with an increase of temperature, ib. 
Iron, its effect in protecting copper from action of seawater, 328- 
346 — magnetic phaenomena depending on its rotation, 117. 347. 
, soft, its effect in intercepting rotate- magnetism, 470. 
J 
Johnson, J. R,, M. D. F. R. S , his further observations on 
pi an arise, 247-255-. 
