210 
way, it will be perceived that it will require care 
and I'epeated applications to destroy them, as the 
ova and the insects are often possessing the 
bi'anches at one and the same time. 
Those kinds producing a cotton-like secretion, 
such as we see on the stems and branches of the 
Apple tree, on the Beech and Larch leaves, &c. 
with a view to economy, it will require to be un- 
clothed pretty well with clear water or soap suds, 
forced on with the engine, that less of the Mixture 
may be necessary to destroy the insect. 
For those plants and trees of the most deli- 
cate or tender kind, the Mixture (No. 1) must be 
applied ; and in other cases, such as on ornamental 
trees and shrubs, (No. 1 ) may be resorted to, 
using the engine and wisk at all times when they 
can be applied ; and in all cases it will be better 
to repeat the applications the next day, or not 
later than two days after, that the destruction of 
the half-killed insects and others that have been 
missed, may be rendered complete. The most 
proper time for the application will be in a morn- 
ing or evening, when the sun is not powerful, as 
the leaves of some kind of trees would be liable to be 
scorched, if made wet in the heat of the day. At 
the time of rain it must also be avoided, as wet 
weather would tend to weaken the Mixtures. 
Those insects infesting the roots of various plants, 
must be destroyed with the Mixture (No. 6.) See 
Currant bush. 
Caterpillars, — Some kinds of Caterpillars 
