148 



H. H. New, 



Method III. Comparison of strict 4's, strict 2's and interme- 

 diates. 



In the pure-bred lot there are 22.49 + per cent strict 4's, 30.69 + 

 per cent strict 2's and 45.89+ per cent intermediates; in the 

 hybrid lot 47.30 + per cent of strict 4's, 18.13 + per cent of strict 

 2's and 32.86 4- per cent of intermediates. 



The per cent of 2-minus conditions is too small in both strains 

 to furnish a basis of comparison. 



Exjjernnent 2 



Eggs of several females and milt of several males ot each spe- 

 cies used. Killed three hours and fifty-five minutes after fertili- 

 zation. 



TABLE II 



Method I. Comparison of average number of blastomeres, the 

 average in the pure bred-lot is 3.13 + ; that in the hybrid lot 3.27 +. 



Method II. Comparison of all 4's and all 2's. In the pure-bred 

 lot there are 58.56 + per cent of 4's and 34-9^ + per cent of 2's; 

 in the hybrid lot 69.74 + per cent of 4's and 25.71 + per cent 

 of 2's. 



Method III. Comparison of strict 4's, strict 2's and interme- 

 diates. 



In the pure-bred lot there are 29.45 + per cent of strict 4's, 

 15.06 + per centof strict 2's and49. 31 + per cent of intermediates; 



