PEACH mildew 
7 
thoroughness with which it is applied, and pains should betaken to 
reach all parts of the tree. A nozzle that breaks up the spray 
well will save much time. Fresh unslacked lime only should be used. 
It should be slacked in water in a separate vessel diluted to a thin 
whitewash and strained through one or two thicknesses of burlap 
or sacking, or through a strainer with openings the size of a pin 
head, before using. This prevents the clogging of the nozzles v\ith 
any of the coarse material left after slacking. The copper sulphate 
should be dissolved in warm water if wanted for immediate use. 
It may be dissolved in a considerable quantity of cold water by 
suspending it in a sack just beneath the surface. If to be used in 
large quantities it is well to make up a stock solution by dissolving 
fifty pounds in twenty-five gallons of water. Keep well covered to pre¬ 
vent evaporation. Two gallons of this solution contains the four 
pounds of copper sulphate called for in formula A, or one gallon 
contains the two pounds called for in formula B. The required 
amount of this solution should be diluted to at least thirty gallons 
before the lime water is added. The lime may be slacked in large 
quantities, in which condition it will keep well all summer, and the 
amount of lime water or paste required may be determined by a 
chemical test. 
For this test potassium ferro-cyanide may be secured of any 
druggist and prepared for use by dissolving in ten times its bulk of 
water. A quantity of lime water is then added to the diluted cop¬ 
per solution, stirred well and a drop of cyanide dropped upon the 
surface. If it gives a reddish brown color to the mixture, more lime 
must be added and the test repeated until no reaction occurs. This 
indicates that all harmless acids of the copper have been neutralized 
and the mixture is ready for use. Red litmus paper may be used 
and lime added until the solution turns the paper to a blue color. 
Bordeaux mixture deteriorates rapidly and should be used as 
soon as prepared. While being sprayed it requires constant stir¬ 
ring. In the preparation of the mixture no metal vessels or tool 
other than copper or brass should be used. 
