12 INTRODUCTION PROTOPLASM THE CELL 



The two asters thus formed may occasionally retain their connec- 

 tion with one another, by means of fine achromatic fibrils which 

 pass from one aster to the other, thus early forming the achro- 



FIG. 12. DIAGRAM OF THE PROPHASE OF MITOSIS. 



a, achromatic spindle ; c, centrosome ; e p, equatorial plate ; A-F, successive stages of tho 

 prophase of mitosis. (After Wilson.) 



matic spindle. More frequently the asters become either partially 

 or entirely separated from each other, after which they continue 



