CONTENTS 
Introduction Ae IO erie asta ho he aaa he el cachiare arana arahcha)'s 
oon and survival in water deficient in dissolved oxygen......... 
tions of fish to differences in hydrogen ion concentrations.......... 
examination of certain Illinois waters with special reference to hydro- 
BeartiGntcatrantraitinde ear cee u ese ai cnsic ny ol mentees, DA 
yo eneral relations of hydrogen ion concentration to other factors........ 
_ Discussion and summary OLSrERn Caan wee eae ie oi ee ees 
EeeConclusions: -;o.c..csi<;--2) seven 
- imowledgmenta CY foe. SP EROL CE PRICE eer a ae ea 
i ee ee cc a ec aT 
