Reports to the Board of A gri cult ure. 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 wrapped in blotting paper dropped into the acid and 
water. The proportions are as follows : — \ oz. of cyanide of 
potassium; 1 oz. of sulphuric acid; If 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 paper and then 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 much 
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 cambium with a sharp knife on 
each side, near the “gumming” areas, in July— a long slice, about 
six to eight inches long. New bark forms, and the gumming is then 
relieved. 
