FIRST CHANGE OF THE INSECT. 67 



disorder, and then you have a chance of apply- 

 ing a remedy with safety. 



DESCRIPTION OF THE FIRST CHANGE OF THE 

 INSECT. 



Par. 79. I have discovered by the means 

 of glasses, that some of these insects take wing 

 like the small green fly, such as are seen on 

 roses, &c. ; but those that become winged in 

 this state turn to a very small black fly ; and 

 if the weather is not very warm and favour- 

 able, they will not survive ; but, if it continues 

 warm and fine, they soon gain strength, and fly, 

 and play together in swarms like gnats, in the 

 a|r but they seeni to keep near their native 

 spot, unless carried away suddenly by the wind. 

 Those that take wing in this state, are the 

 largest of the Aphis, which appear so helpless ; 

 but there is another small insect, which is very 

 diminutive, and which appears to stick to the 

 large ones while they remain in the cotton-like 

 web ; these are scarcely discernible without 

 the microscope, but they are much more active 

 on the legs, and soon grow larger ; when 

 they leave the web, they crawl down to the 

 ground, and remain just under the earth till 

 they have gained sufficient strength to find out 

 their winter's abode, during which season 



