268 



MARGARET MORRIS HOSKINS. 



evidence given above I believe we may conclude that the par- 

 thenogenetic egg contains a diploid amount of chromatin, while 

 the fertilized egg in which maturation has been suppressed is 

 triploid. It is evident then that the size of the chromosomes in 

 heated eggs is determined by some other factor than the amount 



B 



D 



FIG. 2. A, normal egg (diploid); B, parthenogenetic egg (diploid); C, fertilized 

 egg heated after maturation (diploid); D, dispermic egg (triploid); E and F, 

 fertilized egg heated immediately after insemination (triploid). 



