igio.] Bordeaux Mixture. 795 



water then added to make up the fifty gallons, the resulting 

 Bordeaux mixture will be of very inferior quality. 



Bordeaux mixture is fully efficacious only when freshly 

 made, and will not keep. If more than a day old it requires 

 to be very thoroughly and constantly stirred while being used, 

 and the use of only freshly-made Bordeaux mixture is far 

 more economical in the long run, and is here strongly 

 recommended. 



If a considerable quantity of Bordeaux mixture is required 

 for use, the. making of stock solutions of copper sulphate 

 and lime, which can be kept through the spraying season 

 and used when wanted, saves both time and labour, and is free 

 from all objection. The stock solutions are made as follows : — 

 Take two 50-gallon barrels. In one dissolve 50 lb. of copper 

 sulphate in exactly 50 gallons of water. In the other slake 

 50 lb. of lime by the gradual addition of a little water; to the 

 creamy paste thus obtained add water to make exactly 50 

 gallons of "milk-of-lime." These stock solutions will keep 

 for months. Before the " milk-of-lime " is used, the contents 

 of the barrel must be thoroughly stirred as the slaked lime will 

 have sunk to the bottom. (Care must be taken to stir the 

 "milk-of-lime" very thoroughly each time before measuring 

 it out, so as to get the slaked lime thoroughly in suspension. 

 If this is done there is no difficulty in obtaining the correct 

 quantity of lime per gallon of fluid.) Each gallon which is 

 taken out from the "stock solutions" will be equivalent, res- 

 pectively, to 1 lb. of copper sulphate or 1 lb. of lime. The 

 required amount of each stock solution is then diluted with 

 water, according to the formula given above, before being- 

 mixed together. The "stock" copper sulphate solution must 

 be measured out in a wooden pail. 



If it be desired to economise space the "stock solution " of 

 copper sulphate may be kept at the strength of 2 lb. of 

 copper sulphate to each gallon of water, that is to say, 100 lb. 

 of copper sulphate may be dissolved in 50 gallons of water. It 

 is not well, however, to increase the strength of the "stock 

 solution" of lime, since the slaked lime in "milk-of-lime" 

 made at the rate of 2 lb. of quicklime to one gallon of water 

 settles so quickly that it cannot be measured out accurately. 



The barrels containing the "stock solutions" must be kept 



3 K 2 



