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pleted they will be found to be of different sizes, and thev 

 then prepare for a change that is about to take place, by 

 emitting from the under side of their body numerous little 

 white downy threads, which fastened to the bark, serve to 

 secure them. The larger ones are females, who manage 

 to throw oft' this covering in a few days, and become fast- 

 ened to the bark as a scale, where they become immovable 

 and apparently inanimate; while the smaller ones continue 

 under their outer skins which serve instead of cocoons, 

 from which they seem to shrink and detach themselves and 

 transform into the perfect insect, having two wings which 

 lie on the top of the body. 'After the larger lice have 

 become fixed, and have thrown oft' their outer coats, they 

 enter upon the pupa, or chrysalis state. But when they 

 have become mature, they do not leave the skins, or shells, 

 covering their bodies, which continue flexible for a time. 

 These larger insects are females, and are destined to remain 

 immovable, and never change their place after they have 

 once become stationary.' After the insects have paired, 

 the female increases in size for a time, and then remains 

 without alteration. Under this skin the eggs are deposited, 

 but not being large enough to cover all her eggs, a white, 

 dpwny substance issues from the under or hinder part of 

 her body, and imbeds them. This is the time the insects 

 spread from tree to tree. The cottony substance is light 

 and is easily borne from one tree to another by the wind, 

 and one female deposits as many as two hundred eggs. 



The most effective time for destroying the insect is 

 while the young are crawling over leaf and branch ; they 

 are then tender, and almost any solution of soap will kill 

 them. The time depends upon the advance of the season, 

 but about the last of the month of May or first of June. 



A wash made of two pounds of potash in seven quarts 

 of water, or a pickle, consisting of a quart of common salt 

 to two gallons of water, would prove a cheap and effectual 

 preventive. Perhaps the best application is a wash made 



