1.0 
CD 
cr> 
iij INJUEIOUS INSECTS. 
O 
The following lecture was delivered before the students 
of the Koval Agricultural College on Thursday, October 
20th, 1881, by Miss Ormerod, author of the ‘ Manual of 
Injurious Insects,’ &c., on Insects injurious to Farm 
Crops, and their treatment. In addition to the Principal, 
the Professors, and a full attendance of students, there 
were present the Eight Honourable Earl Bathurst, 
Mr. H. J. Elwes, Mr. Christopher Bowly, and several 
ladies. 
At the very outset of attention to Economic Ento¬ 
mology, or, in plain words, study of the habits of insects 
that are injurious or beneficial to us, it would clear away 
many of the difficulties which dishearten observers if 
they would but rightly consider what it is that they need 
to Imow, and also how much of this they are already 
in some degree acquainted with. Unfortunately the 
general idea of what is needed is, that we should be able 
to take up an insect, any insect that vce may chance to 
meet with, and name it; but this is very far from being 
the case. What we need is knowledge of the appearance 
and of the habits of the insect-pests throughout their 
lives, but we do not need it with regard to many kinds. 
There are, speaking generally, only about a hundred 
kinds that are commonly injurious to a serious extent in 
this country to our food-crops, forest-trees, and hardy 
fruit. If we take the fruit grown under glass so as to 
include the important consideration of the Phylloxera of 
the vine, and also exceptional attacks, probably about a 
