2 2 FRUIT TREES AND THEIR ENEMIES 



It generally contains, also, much soluble arsenic, and 

 to prevent this from scorching the foliage, lime must 

 be added. The quantities recommended are — 



(2/;) London purple . . . f oz. 

 Lime . . . . f oz. 



Water .... 10 galls. 



These quantities represent a much weaker liquid 

 than those given for the arsenite in the formula {2a). 



London purple does not, on the whole, seem to be 

 so efficacious as Paris green, and the danger of 

 scorching the foliage with it is greater. 



3. Arsenate of lead : Gypsine. — This may either be 

 made by the grower, or bought in the form of a paste. 

 It is generally made by mixing together solutions of 

 arsenate of soda and acetate of lead (sugar of lead), 

 but care must be taken that these are mixed in 

 the right proportions, otherwise the foliage will be 

 scorched, the scorching being more serious if it is 

 the arsenate of soda which is in excess. There are at 

 least two different arsenates of soda on the market^ 

 and the proportions to be used depend on which of 

 these is bought. 



