of money at our (lis])(isal and I)ecaiise of the increasing- numl:)er of 

 new problems l^roui^ht to our attention each year, which recjuire 

 immediate investigation in order to give the needed assistance to 

 the residents of the state. The control of the cabbage maggot by 

 means of poisoned sprat's has been accomplished, and extension 

 letter issued on same. 



The fumigation of greenhouses with Indrocvanic acid gas and 

 the factors which insure success have l)een experimented with by 

 Air. Moore. Much progress has been made in study of the factors 

 causing injury to plants, but further work is needed during the next 

 two years. See page 93. The study of various chemicals to determine 

 their insecticidal value has already led to the discovery of various 

 benzol derivatives which may he used to fumigate animals to de- 

 stroy their external ])arasites without injury to the animal. 



PUBLICATIONS. 



1915-16. 



The following circulars have ]:)een puldished l)y the State En- 

 tomologist's Department in 1915-1916: 



Circular No. 34, Dec. 15, 1914, The Cucumber Beetle. C. A. Sell, 



pp. 6. illustrated. 



Circular No. 35, Jan. 15, 1915, Further Observations on Minnesota 



Birds ; Their Economic Relations 

 to the Agriculturist. F. L. A\^ash- 

 burn, pp. 24, illustrated. 



Circular No. 36. Jan. 30, 1915, The Red Rose Beetle. S. Marco- 



vitch, pp. 6. illustrated. 



Circular No. 33, Sept. 1, 1916, Control of Flies in Rural Districts. 

 Revised Edition. C. W. Howard, pp. 14, illustrated. 



Circular No. 37, Feb. 1, 1916, Entomologist's Report on Inspection 



of Minnesota Nurseries and Im- 

 ported Nurserv Stock for the vear 

 1915. F. L. Washl)urn. pp. 20, il- 

 lustrated. 



Circular No. 38, Ai)ril 4, FU6, Index. Minnesota State Entomolo- 

 gist's Reports. O. J. Wenzel, pp. 40. 



S])ecial bulletin .\o.(S, July, "16 Some Insect Enemies of Corn. War- 

 Agricultural Extension ren A\'illiamson. pp. 13, illustrated. 

 Bulletin 

 State Entomologist's Circu- 

 lar No. 39. 



Circular No. 40, Nov. 15, 1916, Work on the \\'hite Pine Blister 



Rust in Minnesota, 1916. F. L. 

 Washburn, pp. 19, 1 colored plate, 

 illustrated. 



