xxil 



CONTENTS. 



LETTER X. 

 DIRECT BENEFITS DERIVED FROM INSECTS 



As serving for the food of man 

 As affording Medicines 



Dyes 



Wax 



Honey 



Silk 



Page 



- 171191 



- 171 



- 178 



- 181 



- 185 



- 187 



- 188 



LETTEE XI. 

 AFFECTION OF INSECTS FOR THEIR YOUNG ... 192215 



1. Insects which 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 - - - - , ., t 203 



Earwigs - - . v 203 



Spiders - 204 



Ants ... 206 



Wasps .... 21O 



Bees ... . 212 



Humble Bees ... . 213 



Termites - - - - - - - 214 



LETTER XII. 



FOOD OF INSECTS 



Insects which feed on vegetables 



animals ... 



both vegetables and animals 

 Time of feeding .... 



Instruments of nutrition ... 



Proportion of food consumed ... 

 Power of abstinence ... 



- 216226 



- 216 



- 217 



- 219 



- 221 



- 222 



- 224 



- 224 



LETTER XIII. 



FOOD OF INSECTS continued 



Stratagems employed in procuring it 

 Threads of Spiders 

 Webs of House Spiders, &c. 

 Nets of Geometric Spiders 



- 227 244 



- 227244 



- 227 



- 229 

 . 231 



