as 
The principal trips made by the entomological assist- 
ants for these collections and investigations are thirty- 
two in number, and cover, for the two years, 298 days’ 
absence in the field at a distance from Champaign. The 
ornithological field work includes a trip of two months 
to Louisiana, made by Mr. Adams 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. Brode 
and myself, covering five weeks, in 1891, and trips by 
myself and two assistants to Geneva, Delavan, and Win- 
nebago lakes, in Wisconsin, occupying four 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 spring of 1891. 
Artificial cultures of the fungus parasite found most 
efficient for the propagation of 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 injurious insects on their 
premises. 
We also experimented last year with the fruit bark 
beetle, the white grubs, and the Hessian fly, with a view © 
to clearing up doubtful points in the life history of each; 
and with respect to the species last mentioned, we under- 
4 
