310 THE AMERICAN MONTHLY [Nov., 



ment must be used. In this climate it is best, altliough not 

 absolutely necessary, to remove the entrails. Place the speci- 

 men, carefully wrapped in rags, in plenty of this preparation. If 

 wanted to mount, drain off the superfluous oil and mount in 

 glycerine. 



The Chicago Water-Supply in the World's Fair Grounds. 



By smith ELY JELLIFFE, M. D., 



BROOKLYN, N. Y. 



During a short stay at the Fair grounds, I was enabled 

 through the courtesy of Doctors LeGarde, U. S. A., and E. H. 

 Wilson, to filter some water supplied to the Fair in the build- 

 ing of the U. S. Army Hospital. The rhaterial was gathered by 

 filtration through absorbent cotton, the cotton then being washed 

 out in a beaker of water. Though the list is not in any sense 

 as complete as the lists supplied by Messrs B. W. Thomas and 

 H. H. Chace, still it may be of interest to some of the microscop- 

 ists who have not access to these communications. The filtra- 

 tion was done in the last week of August and material was re- 

 served for future study which material was lost by fire. 



VEGETABLE FORMS. 



CYANOPHYCESe. 



Oscillaria, sp. indet. Too fragmentary. • 



DESMIDEiE. 



Penium, sp. indet. 

 Staurastrum citspidatum, Breb. 



DIATOME^. 



Encyonema ventricosa, Kg. 

 Navicula radinsa, Kg. 

 N. rhyncocephala. 

 Pleurosigmn spenceri, W. S. 

 Synedra idna, (Nitzsch). Ehr. 

 S. pulchella, Kg. 

 S. longisssvia, W. S. (?). 

 Friigilaria capiicina, Desm. 

 Asterionellaformosa, Hass 

 Tabellaria floculosa. (Roth). Kg. 

 T. fenestrata, Kg. 



