152 
cold winds, an opinion long entertained by some 
gardeners. I remember when a boy, asking an 
old experienced gardener the eanse of so many 
blistered leaves on the Currant trees ; his reply 
was, they were crippled by the cold wind. If I 
had not been so easily persuaded, and examined 
for myself, I should have found in the concave 
of the leaf a sufficient and correct proof of the 
cause. 
Many of the weaker leaves, in the middle of 
the tree, when the insects become more numer- 
ous, are also infested. But owing to the leaf not 
being so grossy they do not curl up in the same 
manner. In the year 1825, Currant trees, in most 
situations, were so much infested by those depre- 
dator’s that, from the foliage being deprived of its 
sap, and from the excessive power which the sun 
happened to have at the same time, in the mid- 
dle of J une, the greatest portion of the leaves be- 
came exhausted to that degree, that they fell from 
the bushes, and left them almost naked, and the 
fruit was not more than half its proper size, and 
from the fluid ejected by the Aphis falling upon it, 
was rendered entirely useless. In 1827 they were 
much annoyed, but irot so much as in the preced- 
ing year. 
The Black Currant is occasionally infested 
by, I believe, the same species of the Aphis as 
above. 
Foit THEIR Destruction, — It is a good 
plan to. begin about tire middle or latter end of 
