
1905.| On“ Plimmer’s Bodies” and Reproductive Cells. 233 
plasmic vesicle. The vesicle and its contents ultimately forms the so-called 
“cephalic cap” of the spermatozoon. 
The remarkable similarity between’ the structure just described and those 
known as Plimmer’s Bodies will have become obvious. It is not, perhaps, 
Fig. 6. Fre: 7. 

, Fie. 8. Fie. 9. 
Figs. 6 and 7. Later stages of fig. 5. 
Fig. 8. Slightly later stage in the spermatid of man, with centrosomes and tail. 
Fig. 9. Three spermatid nuclei in a single cytoplasmic mass, showing three archo- 
plasmic vesicles in the centre, with two pairs of centrosomes, and a third, less defined, to 
- the left hand. 




accidental that just as in the case of nuclear divisions, so also in the 
cellular inclusions, a parallelism between the cells of reproductive tissues and 
of cancer cells should be found to exist. But we do not on this account 
regard the cells of cancer as ¢dentical with those of the sexual cells, as we were 
careful to point out in our first communication in 1903. 
VOL. LXXVI.—B. R 
