xxii CONTENTS. 



Page 

 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 XI. 



AFFECTION OF INSECTS FOR THEIR YOUNG - 192215 



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



Butterflies - - , r *;. ( - - - 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 XII. 

 'FooD OF 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 XIII. 



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 - - - - - 25 1 



