207 
operation each must be brushed on warm among' 
the leaves, w'ith a soft wisk ; or if the Lettuce 
is planted pretty close together, it may be put 
on with the engine, and assisted by using the 
wisk. When it is supposed the insects are dead, 
a good w'ashing, with clear water, from the en- 
gine, will be of essential service to clear the 
plants, providing rain does not fall at the time. 
Aphis. — This plant is very liable to the 
attacks of the Aphis, as described infesting the 
roots of Currant Trees. 
For their Destruction. — The Mixture 
(No. 6) may be poured at the roots when they 
appear to be attacked. To know when that is 
the case, they must be examined at the roots when 
debility appears in the plant, which will be prin- 
cipally shown by their drooping. 
GENERAL INFORMATION FOR THE 
DESTRUCTION OF INSECTS. 
It would be too tedious, and extend the pages 
of this work much farther than was originally 
contemplated, to enter into a description of the 
whole of the plants sustaining injury from the 
insect race, and at the same time would not add 
much to the utility of the work; therefore, I 
shall content myself with laying down a few 
