MATURATION PHENOMENA OF GERM CELLS. 157 



But though the combinations of paternal and maternal chro- 

 mosomes in the fertilized egg do not support the Mendelian ratio 

 for hybrids, I fully agree with Sutton that "the phenomena of 

 germ-cell divisions and of heredity are seen to have the essential 

 features, viz., purity of units (chromosomes, characters) and the 

 independent transmission of the same." 



UNIVERSITY OF TEXAS, 

 November 29, 1903. 



