Bulletin 



OF The 



Illinois State Laboratory 



OF 



Natural History 



Urbana, Illinois, U. S. A. 



STEPHEN A. FORBES, Ph.D., U U D., 

 Director 



Vol. XI, March, 1917 Article VL 



AN EXPERIMENTAE STUDY OF THE EFFECTS OF 



GAS WASTE UPON FISHES, WITH ESPECIAL, 



REFERENCE TO STREAM POEEUTION 



BY 



Victor E, Shelford, Ph. D. 



