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ROSCOE R. HYDE 



exact measure of the fertilizing power of the egg and sperm the 

 experiments were carried out in the following manner. 



A female was placed in a bottle with four or five males to insure 

 an abundance of sperm. A small piece of banana was introduced 

 on a piece of paper and on this food the female laid her eggs. Each 

 day the food was removed and the eggs picked off individually 

 with the point of a needle. Each batch of eggs was planted on 

 fresh food and the number of eggs recorded. After a few hours 

 new food was given to the parents. This is a most laborious proc- 

 ess so that one cannot carry out as many crosses at a time as 

 might be desired, but this does not invalidate the test as such. 



Since the Woods Hole stock was the most fertile one at hand, 

 six females were tested with their brothers as a control. Atten- 

 tion is called to the fact that these females were about ten days old 

 when the experiment began. Eleven truncate females were tested 

 against the Woods Hole male. Fourteen truncate females were 

 tested against their truncate brothers. These counts have led to 

 the results given in detail in table 14, a, b and c. 



TABLE 13 b 



