122 MARGARET REED LEWIS AND WM. REES B. ROBERTSON. 



PLATE IV. 



FIG. 30. Unstained. Second spermatocyte. Single mass of mitochondria 

 from which granules are elongating toward each pole of the spindle. Zeiss 6 oc. 

 2 mm. lens. 



FIGS. 31-35. Unstained. Different stages of a cell in the second spermatocyte 

 division. Fig. 31 at 10:40 A.M.; Fig. 32 at 11:20 A.M.; Fig. 33 at 12:30 P.M.; 

 Fig. 34 at i P.M.; and Fig. 35 at 2 P.M. The mitochondria form the nebenkern. 



FIGS. 36, 37. N. R. Neutral red granules present during the second spermato- 

 cyte division. Zeiss 6 oc. 2 mm. lens. 



