TREE DISEASES AND TREATMENT 
179 
solutions to give the formula in the total amount of water 
to be used and place each in separate elevated dilution 
tanks, which should hold half as much as the total capa¬ 
city of the spray tank. Thus, if the spray tank holds 200 
gallons, each dilution tank should hold 100 gallons; and, 
according to the above formula, 20 pounds of copper sul¬ 
phate (20 gallons of the stock solution) and 20 pounds of 
lime (20 gallons of stock solution) would be required. To 
each dilution tank add water (one-half the total amount 
of spray) and after stirring, allow the diluted ingredients 
to run, through separate hose or troughs attached to 
faucets near the bottom of the tank, into the strainer on 
the spray tank, where the two solutions come together, 
producing the Bordeaux mixture. Only the quantity 
which can be used during the day should be mixed, as the 
Bordeaux mixture deteriorates on standing. 
In case the dilution tanks are not elevated to admit 
of filling the spray tank by gravity, the diluted solutions 
must be dipped and poured into the latter by hand, a 
bucketful of each simultaneously. This method is advis¬ 
able in small operations, where a few barrels at most are 
needed. 
It is important that Bordeaux mixture should be 
thoroughly strained in order to keep out any coarse parti¬ 
cles that would clog the spray nozzles, and it is a good 
practice to strain the stock solution of lime while pouring 
it into the dilution tank. The best material for a strainer 
is brass wire netting of about 20 meshes to the inch. 
Ammoniacal Copper Carbonate. —The formula for 
ammoniacal copper carbonate is as follows: 
Copper carbonate.ounces 5 
Strong ammonia (26 Baume).pints 2 to 3 
Water to make.gallons 50 
