40 
beds owing to the great number of plants to be treated, thus requir- 
ing so much liquid as to make it an expensive treatment ; he tried 
making a few applications at short distances apart in the bed, but 
not with satisfactory results. In 1884, some of Prof. Cook's corres- 
pondents reported that the substance sometimes injured the cabbage 
plants, and its efficiency varied with the nature of the soil. The 
same year, Mr. Golf “found that Bisulfide of Carbon applied to the 
soil about the roots of radishes, destroyed the maggots that had not 
yet entered the root, but it had no perceptible effect upon those 
within.” 
Pig. 5— Female fly, similar view and magnification as the male fly in fig. 4. 
