8 APPLE. 
The above extract gives date of application, but (to ourselves) not 
precise proportion save to those acquainted with capacity of the U.S.A. 
‘‘barrel.”’ But reports from trustworthy experimenters name one 
pound of poison to a hundred gallons of water as safe and serviceable. 
Prof. Cook remarks :—‘‘ We must use a weak mixture; one pound 
of the poison to a hundred gallons of water is best; then we can make 
thorough work without injury to our trees.” * 
Prof. F. M. Webster, of Purdue University, U.§.A., also a 
thoroughly trustworthy authority, recommended Paris-green, sprayed 
as a liquid mixture, as a good remedy. ‘Used in this form one 
pound of the poison to one hundred and forty or fifty gallons of 
water, if applied in the form of a spray, by the aid of any of the 
machines mentioned, . . . will be found effective against the Codlin 
Moth.’”’—(F’. M. W.) 
In our Linglish experiments it appears hazardous to use the Paris-green 
miature as strong as mentioned above.| For spraying Apple-trees as a 
remedy for caterpillar, one ounce of Paris-green to twenty gallons of 
water was found sufficient. Mr. Masters, of Evesham, considered the 
green may safely be applied up to twice the above-named strength, 
namely, one ounce to ten gallons of water; but in all cases where the 
operators are not accustomed to the use of arsenical poisons, careful 
experiment should be made as to what strength can be borne, before 
spraying on a large scale. 
The Paris-green is procurable from Messrs. Blundell & Spence, 
Hull, in a slightly damped condition, and also more finely ground 
than the ordinary powder, and in this condition is safer for use, as the 
powder does not fly about, and is therefore not so liable to be pre- 
judicially inhaled by the mixer, also a smaller quantity is required. 
If the same proportion of this prepared Paris-green is used as of the 
ordinary powder, great damage is likely to ensue. 
It must be remembered, as was brought forward when the use of 
Paris-green was introduced into England by our Evesham Committee 
of Experiment in 1890, that this aceto-arsenite of copper is poisonous, 
and therefore should be kept safely out of the way of children or 
careless people. 
Details of method of application are now so fully before the public 
that it seems needless to repeat them here; but for those who may 
care to haye all requisite observations on methods of applying the 
arsenite, and also precautions in its use, I may mention that I should 
be happy to forward gratuitously to applicants copies of my own 
eight-page pamphlet on this subject. 
The kinds of sprayers, whether as knapsack or hand or horse 
* A.J. Cook, Proc. 7th Ann. Meeting Soc. Prom. Agr. Sci., Buffalo, N. Y., 1886. 
+ For details see my ‘Manual,’ second edition, pp. 357-360. 
