%'^ 



404 INDEX. 



engineering and mining, for the determination of the thickness of 

 solid substances not otherwise measurable, 319 ^ 



Secretions, animal, observations on, by Hermann, 128 



Sicily, observations on the geology of, 1 



Silver, the quantity of, annually consumed in Britain, 346 



Siren lacertina, observations on, by P. Neill, 298 



Smelting of iron, by heated air, observations on, 183 



Springs, thermal, observations on, by Daubeny, 49. — Mineral, on the 

 origin of, 290 



StifFt, M., on the probable origin of mineral springs, 290 



System of chemistry by Dr Thomson, noticed, 205 



Temperature, subterranean, observations on, 194 

 Tertiary deposits, observations on by Brongniart and Boue, 159, 341 

 Thermometer, register, kept at Wanlockhead by Mr Lang, 335 

 Torrie, T. Jameson, his account of eruption of Mount Vesuvius, 384 



Utility of early elementary instruction in the natural sciences, observa- 

 tions on, 364 



Vesuvius, eruption of, noticed, 384 



Vibration of wires, considered by Edward Sang, 308 



Volcanoes of Central Asia, described, 145 



Wellington Valley, in New Holland, described, 301 

 Wernerian Natural History Society, proceedings of, 191, 391 



