xxii CONTENTS. 



Pago 

 LETTER X. 



Direct Benefits derived from Insects . - - 171 — 191 



As serving for the food of man - - - - - 171 



As affording Medicines - - - - - -178 



Dyes - - - - - - - 181 



Wax - - - - - - - 185 



Honey - - - - - - - 187 



Silk - - - - - - - 188 



LETTER XL 



Affection of Insects for their Young . - - 192 — 215 



1. Insects Tckich perish before their young come into existence - 192 — 201 



Butterflies - - - - - - - 192 



Ichneumons - - - - - - -193 



Sand Wasps, &c. - - - - - - - 195 



Wild Bees - - - - - - - 197 



Beetles - - - - - - - - 198 



2. Insects which attend their young when hatched - - - 202 — 215 



Mason Wasp - - - - - - - 202 



Saw Fly - - - - - - - - 202 



Wood-boring Beetle - - - - - - 203 



Field Bug - - - - - - - 203 



Earwigs - - - - - - - - 203 



Spiders - - - - - - - - 204 



Ants . - - - - - - - 206 



Wasps - - - - - - - - 210 



Bees - - - - . - - - - 212 



Humble Bees - - - - - - - 213 



Termites -------- 214 



LETTER XIL 



Food op Insects -.-.._ 216 — 226 



Insects which feed on vegetables - - - - -216 



animals - - - - - -217 



both vegetables and animals - - - 219 



Time of feeding - - - - - - - 221 



Instruments of nutrition ._..-. 222 



Proportion of food consumed .---.- 224 

 Power of abstinence ----.. 224 



LETTER XIIL 



Food of Insects — continued . . - - - 227 — 244 



Stratagems employed in procuring it - - - -• 227 — 244 



Threads of Spiders - - - - - - 227 



Webs of House Spiders, &c. - - - - - 229 



Nets of Geometric Spiders - - - - -23] 



