346 



A. FRANKLIN SHULL. 



of that time very little hatching occurred. The 238 eggs that 

 remained (less than half of the original lot) were divided into 

 two equal parts, one of which was allowed to become dry and 

 remain so for 13 hours on December 4. The subsequent hatching 

 is recorded in Table XL The results confirm the conclusions 

 drawn from Table X. 



TABLE XI. 



Showing the Effect of Drying Eggs for a Short Period U pon the Proportion that Hatch 

 in a Cross-Fertilized Lot of Eggs of Hydatina Senta. The Cross was the Reciprocal 

 of that in Table X. 



In another experiment of this kind inbred eggs (eggs laid by 

 females fertilized by males of the same line) of a line in which a 

 relatively small proportion of the eggs normally hatched were 

 used. The eggs were kept five 'weeks, during the last 12 days 

 of which time no eggs hatched. -The eggs that remained un- 

 hatched were divided into two lots which, by mistake, were made 

 unequal. One lot, consisting of about 130 eggs, was dried over 

 night; the other of 106 eggs, was kept wet. The subsequent 

 hatching of these eggs is recorded in Table XII. 



TABLE XII. 



Showing the Effect of Drying for a Short Period Upon the Hatching of Inbred Eggs 

 of Hydatina Senta. 



Eggs Kept Wet. 



Eggs Dried and Remoistened. 



Unlike the cross-fertilized eggs of Tables X. and XI., drying 

 for a few hours neither increased the number of eggs that hatched 

 nor hastened their time of hatching. 



