INDEX. 379 



Home, (Sir Everard) on some facts respecting the walrus and 

 seal, 100; microscopical observations of, on the materials of 

 the brain, and the ova of animals, and on the analogy between 

 them, 270 ; notice of his Croonian lecture on the nerves of the 

 placenta, 204; observations on the changes of the ovum of 

 the frog during the formation of the tadpole, 295, 296 



Humboldty (Alexandre de) analysis of his Essai Oionostique, 306 ; 

 remarks on his style, 307, 308 ; specimen of it, 309-313, 314 ; 

 comment on its vague and indefinite assertions, 310-313, 314- 

 318 ; his character of Werner, 319 ; remarks on it, 320, 321 ; 

 exposition of his extravagant pretensions, 323 ; his geognosti- 

 cal pasigraphy, 324, 325 ; remarks on it, 325-327 



Hutton's, (Pr.) theory of the earth, sketch of, 74>'76 



Hydrogen and carbon, new compounds of, obtained during the de- 

 composition of oil by h^at, 273-275 



Ice of running water, observations on, 364-366 

 Iguanodoriy a fossil reptile, description of, 304 

 Indigo, common and de-oxidized, composition of, 165 

 Ink, similar to China ink, process for preparing, 141 

 Iodine, means of testing for, 343 ; its presence ascertained irt Sul- 

 phurous mineral waters, 344 

 Ireland, remarks on the population returns of, 217-219; tables 

 and observations on the state of education in that country, 220- 

 227 

 Iron, combinations of with copper, 154; the drawing of iron wire 

 facilitated, 135 ; on the magnetism imparted to iron bodies by 

 rotation, 263, 264 ; alteration in the magnetism of an iron 

 plate, occasioned by a rotation on its axis, 265-268 ; method of 

 browning iron, 329 ; effects of the exposure of iron to air, in 

 high regions, 347 



Jones*s ilygrometer, description of, 27^ 



Karsten, (M.) on combinations of copper with iron, pig-iron, &c., 



154 

 Kater, (Captain) description by, of a floating collimater, 301-304$ 



Laugier, (M.) new mineral discovered by, 156 



Lead, application of the chromate of, in the arts of, 347, 348 



Leeches, medicinal application of, 174 



Light and heat from terrestrial sources, obser^^ations on, 45-61, 



213-216 ; light produced during crystallization, 341 ; on the 



colour of glass as affected by it, 341, 342 

 Lightning, report on conductors' of, 143-147; course of lightning 



under ground, 339-341 ; effects of iiglitning, 367, 368 

 fiime, geological notice of, the carbonate of, 82 



