239 
not be improper to remai'k here, that fiimigatiou 
is not efficacious for the destruction of any other 
kind of insects. I need therefore scarcely say it 
will be better to abolish that practice, so long mis- 
applied by many, except for the destruction of the 
Aphis. 
The Acarus, or Red Spider. — For descrip- 
tion see on Peach and Nectarines. 
Many different kinds of plants in Glass- 
houses are infested by the Red Spider, which 
often prevails to a serious degree. 
For their Destruction. — Any time from 
the month of October to the beginning of 
February, the early Forcing-houses infested the 
preceding summer should be well washed, in all 
parts where the Spider is at all likely to be se- 
creted, and the later Forcing-houses at a later 
period, but not to be too late for them to have 
quitted their retreats before the application. The 
Mixture (No.*^^) may be done on quite warm 
with the engine, or brushed on with a painter’s 
brush, with the addition of one pint of turpentine. 
See on Vines in Forcing-houses. The bai-k-pits, 
floors, flues, &c. may be well watered over with 
boiling water, for their destruction. When in the 
act of feeding in the spring and summer months, 
those plants infested must be dipped over head in 
the Mixture, leaving out the turpentine ; and in 
all cases where the plants are lai-ge or inconvenient 
to remove, they may be brushed with the Mixture, 
with a soft painter’s brush, on the under side of 
