108 THE ENTOMOLOGIST. 
more or less injury to the leaves. In cases where Paris-green 
is not obtainable this might be used as a substitute, in the 
proportion of one ounce to a pound of a flour, which should 
always be coloured with some black powder, such as char- 
coal or black antimony, so as to lessen the risk of accident 
from its use. 
“ Powdered Cobalt or Fly-poison.—Another arsenical com- 
pound was also tested, known in commerce as powdered 
cobalt, or fly-poison. This was used in the same proportions 
as the last mentioned, and with similar results, but, owing to 
its higher price, we do not recommend it for general use. 
“ Sulphate of Copper (Blue-stone).—A strong solution of 
this salt was tried in the proportion of two ounces to one 
gallon of water, and showered on the vines with a watering- 
pot, without damage to either the insect or the plant. 
“ Bichromate of Potash.—This is a poisonous substance 
largely used in dyeing, and one which has attracted some 
attention in France of late, as a remedy for insects. We used 
it dissolved in water, in the proportion of two ounces to three 
gallons of water. This killed the insects effectually, but, at 
the same time, destroyed the plants. Whether, in a more 
diluted form, this remedy could be effectively used without 
injury to the foliage, we are unable at present to say, but 
shall experiment further with it. 
“ Powdered Hellebore.—This powerful irritant, which is so 
effectual as a remedy for the currant-worm, we tried without 
perceptible effect, both in powder and also mixed with 
water. Several other poisonous substances were also used 
with like results. 
“ Carbonate of Lime.—There are several preparations sold 
under this name, which we found to vary much in composi- 
tion and: character, and equally so in effect. We tried an 
article known as Dougall’s, without any good result, but 
succeeded better with one prepared by Lynam Brothers, of 
Toronto,—a black powder, manufactured, we understand, from 
coal-tar. This destroyed a large proportion of the larvae, but 
we doubt whether it would kill the perfect insect; it is, 
moreover, used in an undiluted form, which would render its 
cost greater than that of the Paris-green mixture. Some see 
no advantage in using it, although the fact of its being less 
poisonous may induce some to try it who are prejudiced 
against Paris-green. 
