152 
To make the Bordeaux mixture, dissolve the copper sulphate in 
about 20 gallons of water — best done by placing the sulphate, or 
bluestone, as it is often called, in a gunny sack or other stout cloth 
bag and suspending it in the water. It will dissolve in a day or so, 
and if co^•ered to prevent evaporation it will keep indefinitely. If less 
than 50 gallons of the Bordeaux mixture is needed, or if the solu- 
tion is wanted immediately, the bluestone may be readily dissolved 
in hot water. f In another vessel slake the lime, adding the water 
slowly, to obtain a smooth, creamy liquid, using barely enough wa- 
ter to cover the lime after it has settled. In this condition, if evap- 
oration is prevented, it will, like the copper-sulphate solution, keep 
indefinitely. 
When ready to spray add enough water to each stock solution, 
separately, to make 25 gallons, stir each thoroly, and then mix the 
two together. This may be done by having the barrels containing 
the two solutions on a high support, with plugs near the bottom so 
that both solutions can be run into a third vessel below, the operator 
stirring the fluids as they unite. Or, if such an apparatus is not ob- 
tainable, the mixture may be made by pouring the two fluids to- 
gether from buckets (Fig. 41). 
Fig. 41. Method of preparing Bordeaux mixture by hand. 
(Missouri Experiment Station.) 
For the combined fungicide and insecticide, add five or six ©unces 
of Paris green, previously made into a paste with water, to fifty gal- 
tCopper sulphate, either dry or in solution, corrodes iron, and a wooden, 
earthen, brass, or copper vessel should be used. 
