704 Report oF THE HortTICULTURIST OF THE 
15. Power machines are not practical for spraying orchards. 
16. In spraying large trees bamboo extensions should be used. 
17. Each person should select a sprayer that is suited to his 
particular needs. 
18. The same sprayer should not be expected to do all kinds of 
work with equal satisfaction. 
19. No liquid has as yet been found that is satisfactory for 
killing insects that feed on cabbage. 
20. Hand Paris green sifters are effective for poisoning worms 
(larvee) that feed on cabbage. 
21. Poison in the dry form is best to use against some insects. 
For applying this and for distributing sulphur eit tobacco dust in 
greenhouses the powder guns are useful. 
Borpgaux Mixture. 
Bordeaux mixture is made by dissolving four pounds of pulver 
ized copper sulphate in from half to two-thirds of a barrel of cold 
water. The necessary amount of fresh slaked lime is then poured 
into the barrel in the form of a thin whitewash and the whole 
mixture diluted to 45 gallons. The copper sulphate will dis- 
solve more readily if it is suspended near the upper surface of the 
water. A basket or coarse sacking may conveniently be used for 
this purpose. If the solution is wanted at once hot water may be 
used to dissolve the copper sulphate since it dissolves more quickly 
in hot water than in cold. It should never be dissolved in iron 
vessels. This formula is best for general use, but for potatoes the 
mixture should be stronger, using one pound of copper sulphate 
to make seven gallons of the mixture. 
Weighing and Straining the Lime. 
When the mixture is used in power spraying machines with sta- 
tionary nozzles it should be run through a sieve so as to take out 
all particles that might clog the nozzles. When hand pumps are 
used straining will not be necessary if care is used, in pouring the 
lime. 
The amount of lime necessary to form the Bordeaux mixture 
was formerly determined by weighing, using two-thirds as much 
lime as copper sulphate, but by means of the potassium ferro- 
cyanide test the necessity of weighing the lime is now obviated. 
