SPERMATOGENESIS OF CANCER MAGISTER. 297 



8. A polar view of the metaphase stage of the reduction divi- 

 sion reveals sixty chromosomes distributed throughout the entire 

 plane of the equator. 



9. The division of the primary spermatocytes results in secon- 

 dary spermatocytes, each of which contains a chromatoid body. 



10. The second spermatocyte division is equational and im- 

 mediately follows the reduction division. A polar view of the 

 metaphase stage of the equational division reveals sixty chromo- 

 somes which are about half the size of those found during the 

 reduction division. 



11. The chromatoid body passes undivided to one pole during 

 the division of the secondary spermatocyte, resulting in the for- 

 mation of two classes of spermatids, one of which contains the 

 chromatoid body, while the other is without such a structure. 



12. The chromatoid body is soon expelled from the spermatids 

 which contain it, thus making all the spermatids alike in struc- 

 ture and appearance. 



13. The nucleus of the spermatid loses its large quantity of 

 intensely staining chromatin, while at the same time a mito- 

 chondria-like mass makes its appearance in the cytoplasm. Also 

 one or two vacuoles are formed in the cytoplasm. 



14. As the transformations go on the nucleus becomes elliptical 

 and wanders to one pole of the cell. The vacuoles fuse into a 

 single large vacuole which then takes a position at the opposite 

 pole of the cell. The mitochondria-like mass wanders in between 

 these two structures, becomes ring-like, and within its center 

 and above the karyosome-like body of the nucleus, the centre- 

 some becomes stationed. Soon a second vacuole makes its ap- 

 pearance at the distal end of the first one. 



15. The two vacuoles gradually transform into the first and 

 second vesicles. The centrosome and karyosome-like body of 

 the nucleus become fused into the central body, which runs 

 through the middle of the second vesicle, while the nucleus and 

 mitochondria-like ring unite into a nucleus-mitochondrial cup 

 from which the rays of the spermatozoon are produced. 



1 6. The mature spermatozoa are oval bodies tightly packed 

 within membranous spermatophores. 



17. When the mature spermatozoa are surrounded with salt 



