io8 



RISEN. 



[VOL. I. 



morphous spermatogonia and their offspring is through twenty- 

 four chromosomes and somatic division. The last generation 

 of these cells gives rise to the auxocytes. 



The auxocytes are characterized as follows : They possess 

 a bouquet stage ; they are the first cells with twelve chromo- 

 somes ; their mitosis is heterotypic and by equation ; they pos- 



''"*' * n ft:; ';*'r 



-lyp-iV:--*^' 



FIG. 7. 



FIG. 9. 



\ '" 



:< ^%"^T 



FIG. ro. 



FIG. it. 



FIG. 12. 



FIG. 13. 



FIGS. 7-13 represent a broken series of leaders illustrating the formation of the leader and 

 the chromosome. 



FIG. 7. Isolated row of chromioles surrounded by chromoplasm and suspended in a network 



of linosomes. 

 FIG. 8. Chromoplast with twelve leaders of chromioles. From the imperfect resting stage of 



the polymorphous spermatogonium. 

 FIG. 9. Chromoplast with five leaders. Each leader is made up of chromomeres, and each 



chromomere consists of three or more chromioles surrounded by chromoplasm. A net- 

 work of linosomes between the chromomeres. 

 FIG. 10. Three chromomeres, each with six chromioles surrounded by a chromoplasm and 



suspended in a network of linosomes. 

 FIG. ii. A pretzel chromosome containing chromioles and two chromoplasts with endochro- 



matic granules. 

 FIG. 12. A chromosome from the metaphase. It contains thirty-six chromioles and a terminal 



chromoplast with an endochromatic granule. 

 FIG. 13. Part of a chromosome from the spermatocyte. 



