SMALL FRUITS AND PLANTS 151 
advantage. In his experiments Professor Sanderson 
used small paper covers, pyramidal in shape, the apex 
being eight inches high and fastened to the inside of a 
wooden frame three inches high by twenty inches 
square. The lower edge of the frame was beveled on 
the lower edge and could be easily pressed into the 
soil. A good quality of building paper, cut in one 
piece, can be used as covers. ‘The cost of the covers 
complete should not exceed four cents each. 
After making over seventy-five tests Professor 
Sanderson is of the opinion that about four-tenth (0.4) 
gramme cyanide per cubic foot exposed ten minutes 
is sufficient. In some tests young cantaloupes, fumi- 
gated immediately after a shower, were somewhat 
injured. The plants should be as dry as possible and 
the amount of cyanide reduced to three-tenths (0.3) 
gramme per cubic foot in some cases. ‘The seemingly 
large amount of gas used on these low-growing plants 
is due to the fact that a larger proportion is lost in the 
small covers than in a large enclosure. Where plants 
are 5 x 5 feet apart, the cost of fumigation per acre, 
even at the maximum amount, is about seventy-five 
cents for chemicals. Two men with one hundred 
covers should fumigate from three to five acres per 
day, depending somewhat on conditions. 
Plants in rows.—The fumigation of plants in rows 
is rather difficult and expensive. To compensate for 
the influence of soil and foliage, a larger amount of 
gas per cubic foot of space must be used to accomplish 
the same results than in a box or other enclosure. 
Prof. C. L. Penny, chemist at the Delaware Experi- 
ment Station, has shown conclusively by analyses that 
