Fig. 39. — Idem. Same view. Eleven dyads at lower pole and eleven 

 plus the accessory at the upper. 



Fig. 40. — Second spermatocyte metaphase. Eleven dyads present, plus 

 the accessory, which is about the size of the No. lO's as in the sper- 

 matogonia. Because of its failure to divide in the last mitosis, the 

 accessory is just twice as large in comparison with the other chro- 

 mosomes. 



Fig. 41. — Second spermatocyte metaphase. Eleven dyads present, but 

 no accessory. The unnumbered element near the center of the complex 

 does not belong in the cell. It is a spot of ink that accidentally got on 

 the drawing and was overlooked in the correction of the proof. In this 

 and the preceding cell the relative sizes of the chromosomes are very 

 apparent. Nos. 12, 11 and 10 may easily be recognized by their large 

 size, and 1, 2 and 3 by their small size. 



Fig. 42. — Second spermatocyte anaphase, eleven chromosomes. 



Fig. 4S.— Idem. 



Fig. 44. — Second spermatocyte anaphase, twelve chromosomes. 



Fig, 44a. — Fragment of figure 44 found in next section. 



Fig. 45. — Another second spermatocyte anaphase, twelve chromosomes. 

 The large round element in the left part of the figure is not present 

 in the cell but is the result of the same accident as that in figure 41. 

 It is to be disregarded. 



Fig. 46. — A spermatid of the twelve-chromosome type. Accessory viewed 

 from end. 



