Extract of a Letter, fyc. 



223 



cutting off the infected leaf. I had observed, that the leaf 

 once attacked, soon decayed, and fell off ; but in the mean 

 time, the animals had removed to another ; and the leaf, 

 from the moment of the attack, seemed to cease to perform 

 its office. In short, by persevering in this amputation, my 

 plants became the most healthy I have ever seen housed. * 

 " To destroy the insects in the wood and walls, washing 

 them with a solution of corrosive sublimate in water, I found 

 effectual. But care must be taken that none falls on the 

 plant ; and the workmen must be apprised of the strength 

 of the poison." 



VOL. II. 



Hh 



