By the Right Hon. Sir Joseph Banks, Bart. 165 



suggested the expedient of white-washing trees completely 

 over, in winter time, after they have been pruned, as likely 

 to destroy this insect ; and told me that it had been found 

 a decisive remedy against moss, by a gentleman who had 

 tried it in Pembrokeshire. 



July, 1793. In the beginning of this month I first observed 

 the insect fastened on the stems of the Codlin trees, near 

 the insertion of the branches, in my garden at Spring Grove. 

 I shewed them to Smith, my gardener, who had not be- 

 fore observed them, and he assured me, that he had never, 

 in his practice as a gardener, before seen them. 



December. Mr. Dickson tells me, that the insect has this 

 year wholly disappeared in a garden at Bethnal Green, where 

 more damage was done by it in the year 1790, than any 

 where else, several newly grafted Apple trees having been 

 entirely destroyed. He is of opinion, that it is a native 

 insect of this country, and has its seasons, like many others, 

 in which it is more or less abundant, 



January, 1794. Mr. Dickson, who at my desire had seen 

 Mr. Duthis' gardener at Bethnal Green, above mentioned, 

 brings word from him, that when the insect first appeared in 

 the autumn of 1789, he thought himself wholly ruined ; but 

 that now he receives very little damage by it. A thunder- 

 storm that happened when they were abundant in his gar- 

 den destroyed great quantities ; since that time he employs 

 men to rub the insects with their hands from the stocks, and 

 in this manner one man will clean a thousand grafted stocks 

 in a day. He says, that care must be taken to tread the 

 ground close to the roots, as the greatest damage is done by 

 these insects, when by means of cracks in the earth, they 



