62 EXPERIMENT STATION. [Jan. 



position certainty in results may be obtained; and with these 

 as a basis for comparison, to extend the investigation to the 

 ordinary commercial materials, and ultimately to find an ex- 

 planation for the diverse and often contradictory results so 

 frequently met with in commercial spraying. In this work the 

 services of the chemical division are necessary in making chemi- 

 cal studies of the different materials ; of the entomological 

 division in the preparation and application of these materials, 

 and in the study of the results ; and very possibly the botanical 

 division may be called on for assistance in an examination of 

 the effects of these treatments on the plant tissues. The field 

 for experiment in this subject is very large, and at present we 

 have very little accurate, positive knowledge of it. Thus far 

 the work has not progressed sufficiently to give any results, and 

 ten years promises to be too short for its entire completion, 

 but already some significant points have developed which indi- 

 cate that this investigation will be well worth all the time which 

 it will require. 



