Reports to the Board of Agriculture. 151 



jar should be placed on the floor and the water placed in it. 

 Sulphuric acid is added to the water and then the cyanide of 

 potassium ^^Tapped in blotting paper dropped into the acid and 

 water. The '--roportions are as follows : — \ oz. of cyanide of 

 potassium; 1 oz. of sulphuric acid; l:f oz. of water, for 250 cubic 

 feet of space. 



This can of course be reduced according to the size of the 

 fumigating box or tent. 



It must be remembered that the gas is deadly poisonous to man 

 and that the cyanide of potassium is also a deadly poison. The 

 fumes must not be breathed. The cyanide should be in small lumps, 

 wrapped in blotting jmper and tlien dropped into the acid and water 

 and the box or tent rapidly closed. When opened at the end of an 

 hour, it should be opened so that the wind blows the fumes away 

 from the operator and the box or tent left for half an hour before the 

 stock is removed. 



Scale, Aphis, Thrips, etc., all die under this treatment and mucli 

 future trouble may be saved. 



** Gumming " in Cherry Trees. 



The cause of this disease is certainly not understood. 



Mr. A. J. Prior, who sent specimens, was informed that the 

 surgical treatment of trees suffering from this disease has met with 

 great success. 



I do not know any published accounts of this treatment, but a 

 large grower in Kent follows it, and I believe invented it. 



The trees are cut down to the camliium with a sharp knife on 

 each side, near the " gumming " areas, in July — a long slice, about 

 six to eight inches long. New baric forms, and the gumming is then 

 relieved. 



