270 ~=ReporT OF THE DEPARTMENT OF ENTOMOLOGY OF THB 
The total number of apple buds treated as shown by the above 
table was 1,157, of which 80.6 per ct. set. The total number of 
checks was 1,307, of which 84.3 per ct. set. This difference is 
too slight to indicate that the gas seriously affected the buds 
when the unfavorable conditions previously referred to are 
taken into consideration. 
A further evidence that the gas had no injurious effects is the 
variation in the percentage of treated buds that set. There is 
no relationship between the percentage of treated buds that set 
and the strength of gas or time of exposure. 
The slight difference in growth between the treated buds and 
the checks is not enough to be of much importance and is prob- 
ably due largely. to the late date of setting them in. 
