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the mixture introduced by M. Girard, who commenced 

 experiments in 1888 with the view of checking the 

 disease, but it was not until 1889 that the remedy 

 was made known in England. The first systematic 

 trials were made in England in 1890. The mixture 

 consists of 20 Ibs. of sulphate of copper, 10 Ibs. of 

 quicklime, in solution with 100 gallons of water, this 



7-ROW STRAWSON'S HORSE SPRAYER. 



being the quantity usually recommended to spray an 

 acre of medium top potatoes ; but the quantity must 

 be increased for larger crops, It was urged that the 

 introduction of molasses would help to make the 

 dressing adhere to the leaves, but it has not proved of 

 sufficient value to warrant its adoption. The sulphate 

 of copper is directly responsible for rendering the leaf 

 unsuitable as a host for the fungus. The lime 



