Fig. 77. — 3. A Later Prophase. 

 The ohromatin-granules have 

 each undergone fission into 

 two. 



4. A Complete Spireme. 

 The ehromatin-granules have 

 increased in size, and lie so 

 close together as to produce 

 the appearance of a double 

 thread. 



L_ 



r 



11 



Fig. 78. — 5. A Later Prophase. 

 The double band of chromatin has 

 been split up into four primary 

 chromosomes, each of these pre- 

 serving its double nature. The 

 achromatic spindle is now begin- 

 ning to appear, the fibrils of the 

 spindle converging to two poles 

 which are at opposite ends of 

 the cell. 



6. AFiNALPROPkASE{mona8ter 

 stage) seen in surface view. The 

 primary chromosomes have been 

 guided into the median equatorial 

 plane of the spindle, so as to 

 form a star-shaped figure. Each 

 chromosome lies with its bend 

 towards the centre of the median 

 plane. The prophase is now 

 completed. 



