11 



figure were rotated to the right through 90** so as to hrlng 

 the outer surface of the wedge of cytoplasm on the side to- 

 ward the observer we would have the appearance presented In 

 ?lg. 46. If we should turn this through 180° so as to throw 

 the wedge on the opposite side from the observer the spermatid 

 would appear as in Pig* 47 where just the tips of the orescent 

 shaped wedge are seen. The tips of this crescent progress on 

 so'ound the capsule along the boundary line between the nucleus 

 and the capsule. At the same time the thick side of the wedge 

 Is reduced and the material Is distributed equally around this 

 border-line to form a complete ring, which viewed from any 

 lateral direction, has the appearance shown In Fig. 48. At 

 first the substance of the wedge Is finely alveolar In appear- 

 ance but by the time the ring Is completed It seems to be uni- 

 form throughout and Is stained black with Iron-haematoxylln. 

 It seems to be identical with the mitochondrial substance de- 

 scribed by Koltzoff '06. 



After the mitochondrial ring is completed, the nucleus 

 becomes widely separated from it and the capsule (Figs. 50 

 to 52). This however Is not always the case. In two prepara- 

 tions from which Figs. 33 to 35 and 37 to 43 were drawn, the 

 nucleus remained fitted closely down on the capsule as shown 

 in Fig. 43. As the two different conditions were obtained 

 with the same fixing fluid it is hardly probable that the 

 difference was caused by the fixing. The nucleus at this time 

 looses the last trace of any granular or reticular structure 

 and becomes uniform ih its staining reactions, and somewhat 

 reduced in size. 



