— 7- 



water. The water simply holds the tiny particles sus- 

 pended and carries these to the tree, where they are left 

 by the evaporation of the water. It is very necessary 

 therefore that every bit of the dry powder comes in con- 

 tact with the water and does not float in lumps on its sur- 

 face. This may be done most easily by putting the dry 

 powder in a bottle or jug and partly filling it with 

 water, then corkiag and shaking the vessel vigorously for 

 a few minutes. This solution may then be mixed with a 

 larger quantity of water with no difficulty. The princi- 

 ple is the same as that which your mother follows when 

 she mixes the flour for gravies with a very little water or 

 milk before putting it in the pan. One pound of Paris 

 green and two hundred gallons of "water is the usual 

 strength for the insects mentioned in this lesson. 



Hellebore and London Purple are two other insecti- 

 cides which may be mixed with water and used in place 

 of paris green, but they are usually not so effective. 



When copper sulphate is to be applied to plants, one 

 pound of the crystals is dissolved in fifteen gallons of 

 water. This solution can only be used on plants before 

 the leaves come in the early spring because it would burn 

 the foliage. 



The Bordeaux mixture is simply the copper sulphate 

 solution mixed with a lime solution, and this is neither a 

 complicated nor difficult mixture to prepare. Four 

 pounds copper sulphate are dissolved in a small quantity 

 of water and when this is done add enough water to make 

 a total of twenty-five gallons. Do the same with the 

 lime. Of course the lime solution is not satisfactory 

 unless the rock lime is properly slaked. This means that 

 a small quantity of water must be used until the slaking 

 is completed and then the balance of the twenty-five 



