112 
I deem worthy of notice. I thinkitis a matter of con- 
gratulation and satisfaction to all interested in American 
fisheries that the Europeans have done so well in sending 
exhibits here. I regret to say, however, that all have not 
arrived yet. Germany at first declined to make an ex- 
hibit of this character, but later on its Commission de- 
cided that it would be a good thing to do, and I now un- 
derstand there is a large collection on the way from 
Germany, which may be expected here in a few days. 

SOME PLANKTON ESTIMATES IN THE GREAT 
LAKES. 
BY J. E. REIGHARD. 
In 1881, Prof. 8. A. Forbes conducted at Chicago some 
experiments to determine the first food of the common 
white-fish. The details may be found in his paper,* so that 
it is sufficient here to recall his conclusion, that the young 
white-fish takes as its first food certain minute entomos- 
traca found swimming freely in the open water (Cyclops 
thomasi and Diaptomus sicilus). 
Forbes pointed out, moreover, the importance of deter- 
mining the presence and abundance of these entomostraca 
in any locality in which it is proposed to plant white-fish 
fry. In spite of this advice, nothing appears to have been 
done in the ten years that have passed since the publica- 
tion of Forbes’s paper. 
Fishculturists have annually planted millions of white- 
fish fry without taking the trouble to determine whether 
the waters in which they place them contain the necessary 
food in sufficient quantity. There is urgently needed an 
* The First Food of the Common White-fish, Bulletin No. 6, Illinois State Laboratory of 
Natural History, May, 1883. 
