192 Apple "Scab" or "Black Spot." [june, 



paste is obtained. Add water to make 25 gallons. We have 

 now 25 gallons of copper sulphate solution and 25 gallons of 

 lime milk. When the two substances are thus diluted with 

 water, they . can be mixed together by pouring one into the 

 other, or pailfuls of each can be poured simultaneously or 

 alternately into a third tub, a wooden bucket being used for 

 the copper sulphate solution. It is well to strain the lime 

 milk before the mixing. In this way we obtain 50 gallons 

 of Bordeaux mixture of the best quality. 



Two points are of primary importance in making Bordeaux 

 mixture. The first is that quicklime, as freshly burnt as 

 possible, is used. Powdered air-slaked lime, such as is often 

 found in builder's yards, will not make Bordeaux mixture. 

 The second point to observe is that the two constituents, viz., 

 copper sulphate and lime, are diluted with water as much as 

 possible (consistent with the formula) before being mixed. 

 If concentrated solutions of copper sulphate and lime are mixed 

 together, and water then added to make up the 50 gallons, 

 the resulting Bordeaux mixture will be of a very inferior 

 quality. 



Bordeaux mixture is fully efficacious only when freshly 

 made, and will not keep more than a day or two. 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 strongly recommended. If a considerable quantity of 

 Bordeaux mixture is intended to be used, 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 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 50 gallons. These stock solutions will 

 keep for months. Before being used, the contents of each 

 tub must be thoroughly stirred, then each gallon of water 

 which is taken out will be equivalent respectively to 1 lb. 

 of copper sulphate or 1 lb. of lime. The necessary quantity of 

 stock solution is then diluted with water according to the 



