536 INDEX. 



F 



Fallow-deer. His artifices and and manners, 406. 



Farina. See plants and fexes. Farina of flowers the raw 

 material of wax, 344. 



Feelers of infects. One ufe of them, 95. 



Females. See fexes, man and males. Among infecls, great 

 differences between males and females, 245, 246, 247. 

 Female birds of prey larger, ftronger, and more beautiful 

 than the males, 247. The reverfe takes place among gal- 

 linaceous birds, 247. Changes in body and mind produ- 

 ced by puberty, 271. Arrive fooner at that period thari 

 males, 271. 



Fire-fly. Emits a (liining light in the night, 100. 

 ^ Filhes. Sketch of their llrudure, 87. Much diverfified in 

 figure, 89. Are endowed with the fenfe of hearing, 89. 

 their mode of refpiration, 125. Analogy between them 

 and birds, 126. We are ignorant of the periods when 

 they become fit for multiplying, 272. Cruftaceous kinds 

 caft their fkins annually, 294. The life of every fifh one 

 continued fcene of hoftility, 3S6. Shell-fifli is very prolific, 

 400. Their artifices, 414. Of their migration, 497, 

 Their longevity, 511, 515. 



Flea. A defcription of it, 106. Undergoes a transforma- 

 tion like that of winged infedts, 107. 



Flies. See infedls. An account of the phrygania or fpring- 

 fly, 103. Of the dragon-fly, 103. OfVhe cinyps, the 

 eggs of which give rife to the galls on oak leaves, 105. 

 Gad-fly very troublefome to cattle, 105. Of the common 

 fly, 105. Of the gnat, 105. Spider-fly as large as the 

 mother when it efcapes from the egg, 227, 300. Some 

 depofit their eggs in the leaves of plants, 301. Ichneu- 

 mon flies deftru6iive to bees, 333 \ and other infedls, 387. 

 Food of plants and of animals compared, 30. Man could 

 not live upon herbage alone, 69. Food neceflary for the 

 growth and expaniion of all organifed beings, 214. See 

 growth. The general ingredients of food, 221. Rein- 

 deer, the principal food of the Laplanders, 221. Animal 

 food more ufed in proportion as people recede from the 

 Equator, 223. The nature of man's food determined by 

 the climate, 224. Man deiigned by nature to feed partly 

 on animal and partly on vegetable fubftances, 224. Liv- 

 ing long on a particular Ipecies of food is apt to create 



