i7« 
TREES AS GOOD CITIZENS 
sprayed and the disease to be treated. The following 
formula is quite satisfactory for general work: 
Copper sulphate (bluestone).pounds 3 
Quicklime.pounds 4 
Water to ma ke.gallons 5 o 
For severe diseases on trees with resistant foliage it is 
often advisable to use 4 pounds of bluestone and 6 pounds 
of lime to 50 gallons of water instead of the above formula. 
Directions for Making. —To make a single barrel 
of Bordeaux mixture, dissolve the bluestone in 25 gallons 
of water and in a separate vessel slake the lime and dilute 
it to 25 gallons. Then pour the two solutions simulta¬ 
neously through a strainer into the spray tank. 
If large quantities are to be used, stock solutions of 
the bluestone and lime should always be prepared, thus 
saving the time necessary to dissolve the materials. A 
stock solution of the copper sulphate may be made by 
dissolving it at the rate of 1 pound to each gallon of water. 
Fill a 50-gallon barrel two-thirds or three-fourths full of 
water and place a sack (or box with perforations in the 
bottom and sides) containing 50 pounds of copper sulphate 
in the upper part of the barrel, suspending it by a string or 
copper wire. In from 12 to 24 hours the sulphate will have 
entirely dissolved, and the sack or box should be removed 
and enough water added to fill the barrel. After slight 
stirring, the solution is ready for use. The stock lime may 
be prepared by slaking 50 pounds in a barrel or other 
vessel, and finally adding water to make 50 gallons. In 
slaking the lime sufficient water should be used to prevent 
burning, but not enough to “drown” it, and the mass 
should be continually stirred with a shovel or spading fork 
until a thin paste is formed. 
In making Bordeaux mixture, take the necessary quan¬ 
tities of the stock copper sulphate and the stock lime 
