THE CARRIERS OF THE HERITAGE 19 



membrane and the more compact form of the chromo- 

 somes. At the end of the prophase (Fig. 8) the chro- 

 mosomes have come to lie at the equator of the cell. 



Fij.4. The nesting cell FIg.5. Beginning PPophase flj.6. Esrtq Prophase 



Fi$.7 Prophase 



Ffg. 8. End of Prophas* F! .9. Metaphas* 



Beslnninj Tetophase R$.13. End of Telophose 

 Fros. 4-13. Diagrams illustrating mitosis. After Boveri. 



being connected by the mantle fibers with the cen- 

 trosomes, each of which has now come to occupy a 

 polar position. In the metaphase (Fig. 9) the chromo- 

 somes split lengthwise, and at the beginning of the 



