BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 27. AFD. IV. N:0 6. 29 



selves, which at that period of the maturation have become 

 much narrower and irregiilar iu shape. 



After tliis, all the spermatogenic cells present stages in 

 the division of the nucleus and in different stages of karyo- 

 kinesis. However, the V-shaped chromatin rods seem to be 

 aggregated at one pole of the nucleus. On the inner side of 

 these germinal cells, a number of much smaller spherical cor- 

 puscles are met with, which evidently represent the heads of 

 tlie spermatozoa. Stained with iron-hsematoxyline according 

 to Haidenhain, both the heads and the tails become very di- 

 stinct. I have by no means been able to make clear in what 



sp 



ö^^i 



Transverse section of a ripe male tube. /, longitudinal folds; s, spermablasts: 

 sp, spermatozoa. Highly magnified. 



way the spermatozoa are developed from the spermospores 

 but, to judge by all appearances, the nucleus of the spermo- 

 spore becomes subdivided, the segments of the nucleus giving 

 rise to the main-part of the head. Certainly the spermatozoa 

 do not originate from the spermatogenic cells by direct 

 division. Further investigations may throw light upon this 

 very interesting matter which is so very difficult to elucidate 

 in a perfectly satisfactory manner. 



In ripe male tubes, the longitudinal folds, which were pre- 

 viously very voluminous, now become almost totally oblitera- 

 ted, and present themselves as almost inconspicuous ridges on 

 the inner wall of the tubes. 



