xxii 



CONTENTS. 



Page 



LETTER X. 



Direct Benefits derived from Insects - 253 — 284 



As serving for the food of man - - - 253 



As affording Medicines _ _ - _ 264 



Dyes _ _ - _ 267 



Wax . - . . 274 



Honey _ _ _ . 277 



Silk - - - - 278 



LETTER XI. 



Affection op Insects for their Young - 285 — 321 



1 . Insects which perish before their young come into existence 



286—300 



Butterflies - 286 



Ichneumons - - - - 287 



Sand Wasps, &c. - - - - 290 



Wild Bees - - - - - 293 



Beetles - - - - 294 

 2. Insects which attend their young when hatched - 300 — 321 



Mason Wasp - - - - 301 



Saw Fly - - - - - 301 



Wood-boring Beetle - 302 



Field Bug - - - - - 302 



Earwigs - - - - - 303 



Spiders - - - - - 304 



Ants - - - - - 307 



Wasps - - - - - 313 



Bees - - - - - 316 



Humble Bees - - - 317 



Termites - - - - - 320 



LETTER XIL 



Food op Insects - - - - 322—337 



Insects which feed on vegetables . _ . 322 



animals - - - 324 



both vegetables and animals - 325 



Time of feeding _ . . . 329 



Instruments of nutrition - - - - 331 



Proportion of food consumed - - - 333 



Power of abstinence - - - 334 



LETTER XIII. 



Food of Insects — continued - - - 338 — 365 



Stratagems employed in procuring it - - 338 — 365 



Threads of Spiders - - - - 339 



Webs of House Spiders, &c. - - - 342 



Nets of Geometric Spiders _ . , 344 



