The principal ti-i])s njarln by the (.Mitomological assist- 

 ants for these collections and investi»*ations are thirty- 

 two in number, and cover, for the two years, 298 days' 

 absence in the field at a distance from ('hampai<rn. The 

 ornithological field work includes a trip of two months 

 to Louisiana, made by Mr. Adaus for the collection of 

 Illinois birds in their winter quarters; three weeks' 

 shooting in southern Illinois by two assistants; five 

 more by one assistant in the northern part of the State, 

 besides six weeks' collecting in Champaign county. In 

 ichthyology, one or two men have been out continuously 

 for three and a half months. 



Our outside aquatic operations include a journey to 

 Yellowstone Park and western Montana by Mr. Erode 

 and myself, covering five weeks, in 1891, and trips b}' 

 myself and two assistants to Geneva, Delavan. and Win- 

 nebago lakes, in Wisconsin, occupying fonr weeks in all. 

 I need not say that our trips of this description were 

 not mere expeditions for the collection of specimens, but 

 that they were attended and followed by field and labo- 

 atory studies of the waters, their surroundings, and 

 their contents. 



I may add, under this head, brief mention of the ex- 

 perimental work in economic entomology done at my 

 office. The most important subject of precise investiga- 

 tion belonging here is that of the contagious diseases 

 of insects, upon which we have worked almost continu- 

 ously in the experimental way since the s]iring of 1891. 

 Artificial cultures of the fuijgus parasite found most 

 efficient for the pi'opagation pi such diseases have been 

 made on a large scale, and supplied to all applicants 

 from this State in sufficient quantities to enable them 

 to start disease among ijnjurious insects on their 

 premises. • 



We also experimented last year with the fruit bark 

 beetle, the white grubs, and the Hessian fiy, with a view 

 to clearing up doubtful points in the life history of each ; 

 and with respect to the species last mentioned, we under 



