136 WILLIAM M. GOLDSMITH. 



PLATE II. 



FIGS. 17 TO 20. Nuclei with nucleoli made up of achromatin and the sex- 

 chromosomes. Linin approaching the nucleoli. 



FIGS. 20 TO 29. Successive stages in the disappearance of the nucleolus. 



FIG. 21. Fusion of achromatic part of the nucleolus and linin. 



FIGS. 22 TO 25. Successive stages in the fusion of the true nucleolus and linin, 

 the former becoming indistinguishable from the latter. 



FIGS. 25 TO 30. Formation of the prophase chromosomes for the first spermato- 

 cyte division. 



FIGS. 26 AND 27. Remains of the old nucleolus being drawn to the nuclear 

 membrane. 



FIGS. 28 AND 29. Breaking down the nuclear membrane by the formation of 

 the first spermatocyte spindle. 



FIG. 30. Metaphase plate of the first spermatocyte division. 



