394 
ACKNOWLEDGMENTS 
The writer is especially indebted to Mr. R. E. Greenfield, of the 
Illinois State Water Survey, for numerous suggestions throughout the 
course of the investigation. The paper would have been deficient at 
several points but for his assistance. Acknowledgments are also due 
Messrs. R. E. Richardson and G. C. Baker for advice in various con- 
nections. I am also indebted to Mr. Ralph Bradford, Chief State Fish 
and Game Warden, for the black bass used; to the United States Fisheries 
Station at Fairport; Iowa, for bluegills furnished me; and to Dr. F. W. 
Mohlman, who kindly gave me the results of determinations of shipped 
Illinois River water. 
BIBLIOGRAPHY 
Birge, E. A., and Juday, Chauncy 
11. Inland lakes of Wisconsin. The dissolved gases of the water 
and their biological significance. Bul. XXII (Sci. Ser. 7), Wis. 
Geol. and Nat. Hist. Surv. 
Clark, W. M. 
20. The determination of hydrogen ions. Baltimore. (Contains 
an extensive bibliography.) 
Forbes, S. A., and Richardson, R. E. 
708. The fishes of Illinois. Vol. III, Nat. Hist. Surv. Ill. Sec. ed., 
1920. 
Garrey, W. E. 
16. Resistance of fresh-water fish to changes of osmotic and chem- 
ical conditions. Am. Jour. Physiol. 39: 313-329. 
Greenfield, R. E., and Baker, G. C. 
20. Relationship of hy drogen ion concentration of natural waters 
to carbon dioxide content. Jour. Industr. and Eng. Chem. 12: 
989-992. 
Hall, Ada R. 
21. The effect of oxygen and carbon dioxide on the development 
of certain cold-blooded vertebrates. (To be published.) 
Jewell, M. E. 
20. The quality of water in the Sangamon River. Bul. Ill. State 
Water Surv. 16: 230-246. 
22. The fauna of an acid stream. Ecology, 3: 22-26. 
Juday, Chauncy 
20. Behavior of the larvae of Corethra punctipennis Say. Anatom- 
ical Record, 17: 340. 
