198 



EVJS HOWARD BEKKV. 



chromosomes have assumed the characteristic forms of rods, V's, 

 rings, crosses, etc., preparatory to the final condensation of stage /. 



MATURATION DIVISIONS. 



In Fig. i, and /, the odd chromosome is seen in two of its 

 most characteristic forms, which we encounter again and again 



g 



FIG. 2. First spermatocyte-division ; a, &, metaphase-figures, side-view, show- 

 ing odd chromosome passing undivided to one pole ; c, telophase showing the 

 odd chromosome present in but one of the daughter-cells; i/, f,f,g, metaphase-fig- 

 ures, polar view, showing the odd chromosome, identified by its different level. 



on the first division spindles. Fig. 2, a and b, represent such 

 forms, attached by one spindle fiber and passing bodily to one 

 pole in advance of the other chromosomes. These first division 



