No. 145.] 
737 
have strong confidence that the remedy to which I now resort 
will keep them freed from the bark-louse. But through all this 
district of country the trees are overrun and dying from these 
insects, a tree not living but about three years after it becomes 
badly infested, and on almost every farm several dead trees may 
be seen, and many more which are so far gone that they can 
never recover.” . 
This insect does not appear to have penetrated west, as yet, 
beyond the districts bordering upon Lake Michigan. I found* the 
orchards upon the Mississippi river free from it, and on a most 
particular inspection of the trees of Esquire Baldwin, of Farm 
Ridge, less than a hundred miles west of Chicago, they were found 
to be wholly uninfested. But that it will gradually extend itself 
onwards over the entire west, there can be no doubt. And it is 
to be feared that for some years after its first arrival in each place, 
it will run much the same career it is now doing on the borders 
of Lake Michigan, it being common for a noxious insect when 
newly introduced, to multiply and thrive to a much greater ex¬ 
tent than it does subsequently, after it has become fully natural¬ 
ized. 
At the west it is generally supposed that this insect is a new 
species, peculiar to that section of country, as no distinct de¬ 
scription and account of it is given in works accessible to the 
mass ot readers. And, entertaining this view*, my friend Robert 
W. Kennicott, of West Northfield, Illinois, in a communication 
read* in June last, before the Cleveland Academy of Natural 
Sciences, and published, with a figure of the young larva, in the 
newspaper report of their proceedings, names it the Coccus Pyrus 
Malus , under which name I observe it is since spoken of in some 
of the western agricultural periodicals. But this insect is cer¬ 
tainly identical with the one which u*e have here at the east, which 
has all along been regarded as the same which has long been 
knowm upon the apple and some other trees and shrubs in Europe. 
It was first described by Reaumur, in 1738, who found it upon an 
elm in France ; and it appears to have been named Coccus arbo- 
nm linearis, (which literally means the Linear Bark-louse of 
[Assembly, No. 145.] 47 
