Insects Injurious to the Potato and Apple. 563 



sect cannot escape. Sometimes a caterpillar, or grub, or 

 even the adult insect may be found covered with whitish 

 or yellow bodies of an oval or spherical shape. Such spec- 

 imens should always be left to their own destruction, for 

 those little bodies are invariably the eggs, or chi-ysalids of 

 parasites that will surely accomplish the destruction, not 

 only of the one larva on which they may 1)6 found, but by 

 their development and increase they may lielp largely to keep 

 in check other like pests. Another point I wish to notice. It 

 makes a great difference with your success in battling 

 against insects how well your neighbors care for their trees 

 and crops, and it makes a great difference with them how- 

 well you care for yours. It is very discouraging to a far- 

 mer who uses all his ingenuity to rid his trees and plants 

 of troublesome insects to have his next neighbor's grounds 

 a safe retreat for all sorts of bugs and worms, and a re- 

 cruiting station from which fresh hordes may pour upon 

 his newly cleaned trees and the crops from w^iicli he has 

 toilsomely picked the insects. This is a matter of a great 

 deal of importance. By concerted, rational endeavor, I be- 

 lieve the agriculturists may gain the victory, at least a par- 

 tial victory, over the insect armies that beset them on all 

 sides. But if the work nmst be done by one here and an- 

 other there it goes on slowly and with many defects. 



I cannot here take space to speak of the scientific classi- 

 fication of insects, and of the different sub-orders. Every 

 agriculturist should possess such works as Harris' "Insects 

 Injurious to Yegetation," and Packard's " Guide to the 

 Study of Insects," and in sncli works this will be found. 

 But, as I shall be obliged to use several technical terms fre- 



