580 



component (?) of the odd lies on one side of the equatorial plate and the main, curved 

 portion, on the opposite side. 



Fig, 11. Chromosomes of a primary spermatocyte. The odd chromosome instead 

 of showing a tripartite structure has here apparently separated into curved chromosome 

 and a smaller round one (supernumerary?). 



Figs. 12, 13. Chromosomes of primary spermatocytes showing different positions 

 and shapes of the odd chromosome. 



Fig. 14. A smear preparation showing the result of the division of a primary 

 spermatocyte. Eight chromosomes are visible at one, and nine at the other side of a 

 common cytoplasmic mass. 



Fig. 15. A smear preparation showing a cytoplasmic mass which contains four 

 sets of secondary spermatocyte chromosomes ready for division. Two sets show four 

 and two sets, five chromosomes each. The mass will ultimately give rise to eight 

 spermatids. 



Fig. 16. Nucleus of secondary spermatocyte in resting condition. 



Figs. 17 to 21. Late prophases in the divisions of secondary spermatocytes which 

 contain five chromosomes. 



Fig. 22. A secondary spermatocyte ready for division. The odd chromosome 

 stands apart from the others at the equator of spindle. 



Fig. 23. Smear preparation of a cytoplasmic mass which contains two secondary 

 spermatocyte spindles, one bearing four, the other five chromosomes. 



Fig. 24. A dividing secondary spermatocyte showing the division of the odd 

 chromosome. 



Figs, 25, 26. Late prophases of secondary spermatocytes which have only four 

 chromosomes. 



Fig, 27. Four chromosomes at the equator of the spindle in a secondary sper- 

 matocyte. 



Fig. 28. Anaphase of division of a secondary spermatocyte which bore four 

 chromosomes. 



Figs. 29, 30, 31, 32, Successive stages in the transformation of the nucleus into 

 the head of the spermatozoon. Figs. 29, 30 and 31 are of the nucleus only, Fig. 32 

 includes the cytoplasm as well and a part of the tail. 



Fig. 33. Head of a mature spermatozoon. 



Fig. 34. A portion of the head of a mature spermatozoon showing successive 

 beads of unstained highly refractive material. 



Fig, 35. A Sertoli cell with attached spermatozoa of which only the heads are 

 figured. Magnified about 800 diametei-s, from a smear preparation. 



Nachdruck verboten. 



Zu der „Erwiderung" Ton FRIEDRICH Krauss auf meine Mit- 

 teilung über „Die Natur des Cliordagewebes". 



(Archiv f. mikroskopische Anatomie, Bd. 74, p, 139,) 

 Von F. K. Studnicka (Brunn). 



Zu der „Erwiderung" von Friedrich Krauss^) erlaube ich mir 

 folgendes zu bemerken: 



Nach Krauss, der jetzt seine Präparate mit Rücksicht auf die 

 Frage der Intercellularbrücken einer Ueberprüfung unterworfen hat, 



1) Ueber die intercellulären Verbindungen im Chordagewebe. Er- 

 widerung auf eine von F, K, Studniöka veröffentlichte Abhandlung 

 „Die Natur des Chordagewebes" (Anat. Anz., Bd. 34, 1909, No. 3/4). 



