546 INDEX. 



Toads. Inftances of their being found alive in the heart of trees, and inclofed in foUd' 

 ftones, 127, 128. Their longevity, 514. 



Tongue and palate, the principal inftruments of the fenfe of tafting, 165. 



Touch. See fenfes. 



Tracheae of infefts defcribed, and their ttfes, 118. 



Transformations. Every animal undergoes changes, 286, &c. Transformation of 

 frogs, 289. Cruftaceous animals caft their flaells annually, 290. Serpents annually 

 caft their fkins, ibid. Of the transformations of infefts, ibid. Transformation of 

 the filk-worm, 292 ; of other caterpillars, ibid. The internal parts, as well as the 

 external form, of winged infefts undergo conCderable changes, 295. Spider-fly 

 transformed into a chryfalis before efcapiiig the belly of. its mother, 296. The be- 

 haviour of different caterpillars when about to transform, 298. Transformation of 

 infefts is only the throwing off of temporary coverings, 301, Plants, as well as ani- 

 mals, undergo transformations, 305. Intentions of Nature in changing forms, 308^ 



Trochus deftroys numbers of fliell-filhes, 396. 



Turkey. The great comminuting force of its flomach, 227. 



Urchin. Motions of the fea-urchin defcribed, 141.. 



V 



Vacuum, Sounds cannot be propagated through it, 1 6Si -' 1/-0 



Vegetables. See plants. 

 Vermes. See worms. 

 Tm i«frz;ff« defined, 132. 

 Vifion. See eyes and retina. 



W 



War. Man not the only animal that makes war with its own fpecies, 386. 



Wafp. Solitary wafp digs holes in the fand, where flie depofits her eggs, 148. Feed 

 their young by difgorging like the pigeon, 274. Their manners and operations, 

 349. Their cells compofed of paper, 350. Defcription of their neft, ibid. Their 

 manner of building, 352. Republics of wafps confift of males, females, and neuters, 



" 354. Defcription of the different kinds, 356. Maffacre their young, 389. 



"Wax. Bees wax a refult of a digeftive procefs, 339. 



AVeeping, how performed, and its effefts, 109. Not pecuhar to man, ibid. 



Whales often killed by the fword-filh, 397. 



Winds. Suppofed to impregnate certain plants, 250. This notion refuted, 251, 252. 



Wings. 



