344 



A. FRANKLIN SHULL. 



The other dish was filled with untreated water which was 

 drawn off daily and replaced with fresh water. 

 The hatching of the eggs is recorded in Table IX. 



TABLE IX. 



Showing the Effect of Oxygenation of the Water Upon the Hatching of the Fertilized 

 Eggs of Hydatina Senta. 



The eggs in oxygenated water show a somewhat lower viability 

 in every case. 



