122 N. M. STEVENS. 



is easily distinguished both in acetocarmine preparations and in 

 sections of Flemming material stained with thionin. The 

 plasmosome (p) is even paler than the spireme. In Fig. 2, a 

 prophase, the heterochromosome (*) is also shown. Fig. 3, a 

 tangential section of a first spermatocyte spindle, shows the usual 

 form of the heterochromosome in metaphase, and in Fig. 4 we 

 have it divided into its unequal components. Fig. 5, a, b, c, 

 shows slight variations in the metaphase form of the hetero- 

 chromosome as seen in sections, and d, e the metakinesis of this 

 chromosome, the large size of these two figures being due to the 

 fact that the figures were drawn from acetocarmine preparations. 

 Further details will be given later. 



BRYN MAWR COLLEGE, 

 January 5, 1911. 



