20 
since April 7. He has been responsible for the execution of 
the details of the general plan, and for the technical work on 
aquatic worms. Mr. C. A. Hart, Curator of the collections 
of the State Laboratory, has done the entomological work of the 
Station; Mr. Adolph Hempel has worked on protozoans and 
rotifers; Mrs. Dora Smith has served as our microscopic tech- 
nologist and has had charge of the rooms down town; and Mr. 
Newberry, of Havana, has kept the cabin boat with its equip- 
ment and done duty as a general assistant. I also had the 
services of Mr. Ernest Forbes as general collector for about 
six weeks of the vacation period. Extensive collections and 
studies illustrating the aquatic botany of the Station have been 
made periodically at Havana by Professor Burrill, Mr. Clinton, 
Mr. Yeakel, and Miss Ayers, of the University botanical de- 
partment. Chemical analyses of the waters from our principal 
collecting stations have been made at intervals at the chemical 
laboratory of the University by Professor Palmer, and steps 
have been taken to secure a good map of the locality. Miss 
Lydia M. Hart, artist of the State Laboratory, has been at 
Havana for natural history drawing, and Assistant Professor 
Summers, of the University department of physiology, spent a 
part of his vacation making a large series of photographs of 
the Station and its surroundings for use in illustrating its reports. 
The greater part of our field work was done on seven regular 
stations, visited periodically throughout the year; two on the 
Illinois River, three on Quiver Lake, and one each on Phelps 
and Thompson’s lakes. The river, about five hundred feet wide 
at low-water mark, and at the highest water not less than four 
or five miles across, flows rather sluggishly* over a muddy 
bed, with banks usually of mud or clay, peculiar, however, in 
the vicinity of Havana and for several miles above and below 
that point, in the fact that the eastern and western shores are 
strongly contrasted in character. The former, as already said, 
is a bank of sand from twenty to sixty feet in height, with but 
little mixture of soil, the western border of a sandy plateau 
which stretches back from the river from twelve to fifteen miles. 
The face and summit of this slope and a varying extent of 
country beyond are commonly covered with upland forest trees, 
*According to our observations, made when the river stood nearly at low- 
water mark, the current was less than a mile an hour. 
