INDEX. 
Dihedral angle between two planes of crystals, greneral formula 
for finclini^, 94 — applied to the rhomboid and its derivatives, 95. 
Dodecahedron. Rhombic, in crystallography, theory of its modi- 
fications, 120. 
E 
frozen and thawed. Representation of the molecule of, Plate 
XXVII. 
Elk, fossil, of Ireland, Mr. Weaver on the, 429. 
Embalming, art of, among the Egyptians, 269 — ingredients used 
in, 306 — mode of performing, 309. 
Equilibrium of a magnetic needle under the joint influence of the 
earth and a magnet, general equations of, 6. 
Expansion of the lateral braces of a transit, remarkable effect 
of, 427. 
F 
Faces, secondary, in crystallography, theory of their arrangement, 
121 . 
Faraday, M. Esq. F. R. S., on new compounds of carbon and 
hydrogen, and on the .products of the decomposition of oil by 
heat, 440—466. 
Formula, general, for the dihedral angle between any two planes 
whose equations are given, 9-1. 
for the plane angle between any two straight lines whose 
equations are given, 125. 
G 
Ganglions, their supposed influence in producing animal heat, 
257 — of the skate and electrical eel, 266. 
Gauss, Prof, his method of measuring the angular distance of the 
wires in a transit, 154. 
Gompertz, Benj. Esq. F. R. S., on the law of human mortality, and 
on life contingencies, 513. 
Granville, A. B., M. D. F. R. S., on Egyptian mummies, and on 
the art of embalming among the ancients, 269. 316. 
Gryllotalpa, or mole cricket. Dr. Kidd on its anatomy, 203 — 
Rosel’s account of the insect, and its habits, 204 — its external 
characters, 207 — digestive organs, 222^hlood, 229 — organs of 
respiration, 231 — muscles, 237 — nerves, 238 — female sexual 
organs, 240 — male, 241 — mode of casting its skin, 243 — organ 
of sound, 244 —dimensions 245. 
