of the investigation. The several gentlemen on whose plantations 
the Department's experimental farms have been located have greatly 
facilitated the work b}' careful attention to instructions given as to the 
growing of the crop. 
The principal results of field experiments in 1904 have been pub- 
lished in Farmers' Bulletin No. 212 of this Department. The present 
work deals more especially with results of laboratory investigations 
and other points of interest concerning the insect as a pest to cotton 
and other crops throughout its extended range. 
