242 
Methods of Preventhifj and Checking 
the foliage. London Purple seems also to injure the plant less 
than Paris Green. 
Experiments made with Paris Green in England prove that 
the proper proportion of Paris Green is — 
For apple trees, 5 oz. to 100 gallons of water. 
„ pear trees, 6 oz. to 100 gallons of water. 
„ plum and damson trees, 8 oz. to 100 gallons of water. 
„ currant trees, 8 oz. to 100 gallons of water. 
„ filbert and cob-nut trees, 6 oz. to 100 gallons of water. 
For fruit-trees whose leafage is fully developed, or forest 
trees, a mixture of 10 oz. of Paris Green to 100 gallons of 
water has been found satisfactory in America. Two or three 
pounds of flour ai-e added to this to retain the poison on the 
leaves. 
In her report for May last, presented to the Council of the 
Eoyal Agricultural Society by the Seeds and Plants Diseases 
Committee, Miss Ormerod says : — 
" Very great interest is taken in many parts of the country in the treat- 
ment for destroying orchard moth caterpillars by application of Paris Green 
spraying . . . AVe are continuing to find the benefit of last year's treatment. 
I have reports from various places, where the Paris Green spraying was 
used on a large scale, of winter moth caterpillars (up to date of report) being 
comparatively absent, whilst over a district where (so far as I am aware) 
little or nothing was done in this way, I have report of the caterpillars 
appearing in large numbers." 
Paris Green should be obtained always in the form of paste, 
as it is very difficult to mix it as powder.^ It is most important 
that Paris Green mixtures or washes should be kept stirred 
while being applied, so that they may be of uniform strength, 
and that 3 or 4 quarts of flour should be added to each 
100 gallons of mixture to make it stay upon the leaves. 
LoxDox Purple. 
London Purple is now sold in the form of a powder. The 
solution has been withdrawn, as being so much more active in 
its effects that, unless used very weak and carefully applied in a 
fine spray, there is distinct danger of injury to the foliage. Dr. 
Lintner recommends about 1 lb. of powder to 200 gallons of 
water for ordinary use, and that " eight quarts of flour should be 
added to cause the arsenite to adhere better to the leaves and 
' Fifth Report of the United States Entomological Commimon, 1886-1890. 
Published by the United States Department of Agriculture. 
• Paris Green can be had from Messrs. lUundell and Spence, Upper Thames 
Street, London, at 1«. per lb.; London Purple of Messrs. Hemmiugway, 60 
Mark Lane, London, at iirf. per lb. 
