308 L. J. BACHHUBER. 



PLATE II. 



FIG. 16. Shows a further condensation of the leptotene threads, which finally 

 results in the large spireme. This stage also shows the first appearance of the 

 chromatoid body. 



FIG. 17. The two accessory elements lie a little to one side of the condensing 

 leptotene threads. The accessories can nearly always be identified in these stages. 



FIGS. 1 8, 19. These stages show the leptotene threads coming out of the 

 synezesis stage and giving evidence of a chiasmatype synapsis. 



FIGS. 20, 21. The accessory elements are very conspicuous in the large spireme 

 stages. 



FIG. 22. Cell from a smear, showing evidence of a segmentation of the large 

 spireme. 



FIG. 23. The accessory elements lie a little to one side of the chromosomes 

 massed in the equatorial plate stage, just previous to division. The chromatoid 

 body has migrated into the same plane as the chromosomes. 



FIG. 24. Shows the massing of the chromosomes, which usually hides the 

 accessory elements. The chromatoid body is very prominent. 



FIGS. 25-28. The two accessory chromosomes travel towards the poles long 

 before the division of the ordinary chromosomes. The chromatoid body is still 

 in the plane of the equatorial plate. 



