81 
The lime should ]>e fresh and slaked in small quantities as needed. 
B}' mixino' a small quantity of water with the Paris g-reen until a paste 
is formed it is much more easily distributed in the water. The lime 
may be added to the water in the proper quantity. 
A good average strength of this solution is 1 pound of Paris green 
to 15U gallons of water; but for trees with delicate foliage, such as 
peach, it is advisable to use a much weaker solution. Man\- fruit 
growers are using Paris green of the strength of 1 pound to 100 gal- 
lons, with the addition of lime upon apple trees, without burning the 
foliage. 
ScheeJes green is a similar preparation to Paris green, but differs from 
it in lacking the acetic acid. It is a finer powder than Paris green, is 
much more easily kept in suspension, and the cost is only about half 
that of Paris green. There is but little of this insecticide manu- 
factured and placed upon the market. 
London purple is a waste product in the manufacture of aniline 
dyes. It contains a number of substances, of which the principal ones 
are arsenic and lime. It is quite variable in composition, and is gen- 
erally considered as being not so effective as some of the other arsen- 
icals. For spraying it is now being replaced by the other poisons. 
Both Scheele's green and London purple are prepared for use in 
spraying similarly to Paris green. 
WHITE ARSENIC COMroiXDS. 
If white arsenic is used alone in spraying, it will seriously injure 
the foliage of the trees ])y ])ui'ning. but when combined with other 
chemicals which prevent this burning, it forms the base of our most 
eft'ecti^'e spra3's, any of which can be easily prepared by the fruit 
grower. 
Arseniie of lime. 
AVhite arf^enic pound . . 1 
Lime pounds. . 2 
Water irallon . . 1 
The white arsenic* and the lime are boiled together for not less than 
half an hour in the recjuired amount of water, as it is very ditticult to 
make th(^ lime and arsenic combine. After the combination is com- 
plete enough water is poured in to replace that lost by evaporation. 
This solution may be ke])t as stock, and 1 pint of it ustnl to every 
40 or 50 gallons of water. It is advisable to add more lime to this 
spraying solution in order that all danger of burning may be avoided. 
Although this solution is by far the cheapest spmying material, there 
is much danger of poor combination of the arsenic and lime, leaving 
free arsenic, which will injure the foliagt\ In order that the lime 
may more thoroughly coml)ine with the arsenic, soda has been used to 
facilitate the combination. 
()51-I:— No. 41— Uo 
