Self -Fertilization Induced by Artificial Means. 149 



sperm in each case is indicated in the table by the small letter 

 used as an exponent. The first set of A-eggs was as a rule fer- 

 tilized with the e-sperm and the last set of E-eggs with the a-sperm. 

 Experiment XIII. — 



&100 EnOO E'^lOO EnOO E^' 85 



D^OO DnOO DaOO D^OO D^lOO 



O 98 0100 C 75 O 75 OlOO 



B^ 99 BaOO B-^lOO B<^ 100 B'^ 100 



A^(adtsptm) ^-'G'niil) A<^100 A"^ 85 A^ 99 



In this experiment practically all of the eggs were fertilized 

 by the sperm of another individual. When fewer than the total 

 number segmented (fertilized), immature eggs may have been 

 present. As a check series A, B, C, D and E were self-fertilized. 

 None segmented, except in E, where two eggs out of the twenty 

 present, i. e., 10 per cent, divided. 



The two ether series (self-fertilized) of these same eggs gave 

 the following results : 



Experiment XIV. An experiment similar to the last was carried 

 out, with five other individuals, and gave the following results: 



Despite a few slight discrepancies in this table, the main result 

 is clear. In only two of the five individuals was the sperm capable 

 of cross-fertilization, namely, the e-sperm and the d-sperm. 



There was also a self-fertilized series of these eggs, and in this 

 not any of the eggs segmented. The ether series gave the fol- 

 lowing results : 



