272 TREATISE ON THE CULTURE AND 



means of its hinder legs, which play like fp rings. Some of 

 thefe infects have a manoeuvre worthy of notice. Several 

 fpecies are provided at the extremity of their body with a 

 fmall fharp-pointed implement, but which lies concealed ; 

 and this they draw out in order to depofit their eggs, by 

 making a puncture in the plant that fusts them. By this 

 method, the fir-tree chermes produces that enormous fcaly 

 protuberance which is to be found at the fummit of the 

 branches of that tree, and which is formed by the extravafa- 

 tion of the juices occafioned by the punctures. The young 

 larvae fhelter themfelves in cells contained in the tumour. The 

 directions for deftroying the coccus are applicable to this 

 infect. 



The Thrips. 



The Thrips, of which there are eleven fpecies, alfo belongs 

 to the order Hemiptera. This infect is, in general, fo fmall 

 as to be fcarcely difcerned by the naked eye. It is, however, 

 very pernicious to fruit-trees, fometimes attacking the fruit as 

 well as the leaves. To deftroy this infect, follow the directions 

 given for deftroying the coccus. 



The Phahena, or Moth* 



There are numerous fpecies of this well-known infect, and 

 their caterpillars differ greatly as to fize, lhape, and colour. 

 All of them, after calling their flough feveral times, fpin their 

 cod, in which they are transformed to chryfalids. They are 

 frequently found in this ftate, rolled up in the leaves of fruit- 

 trees ; 



