350 



W. E. HOY, JR. 



The chromosome number appears to vary in a variety of forms. 

 Many reports are apparently antagonistic. It may be that in 

 certain animals the chromosome number differs in different 

 individuals. Evidently much fruitful work can be done in 

 attempting a solution of such differences. 



The chromosome counts in man are difficult of explanation 

 due to the diverse and conflicting results obtained in studies of 

 spermatogenesis. On the face of the evidence it would almost 

 appear that the chromosome number varies. Since Guyer and 

 Montgomery, as well as Jordan, worked on negroes and their 

 results approximate, and since Winiwarter obtained his results 

 from a white man, it has been suggested (Guyer, '14, and Morgan, 

 '14) that the number of chromosomes differs in the two races. 

 If this is true, hybrids might show an intermediate number of 

 chromosomes. Wieman's results, however, contradict this, un- 

 less there is a synpasis of some of the chromosomes in somatic 

 cells. Outside of Flemming's count of 24, the counts in somatic 

 tissues show a number of chromosomes varying between 32 and 

 38. Moore and Arnold report a haploid number of 16. This 

 approaches most nearly to these numbers in the somatic cells. 

 Jordan does not hold to the exact haploid number of 12, for 

 though the number is not lower in his preparations, he states 

 that it may be higher by several more chromosomes. Wilcox 



