MATURATION PHENOMENA 



207 



extraordinary hypothetical division during maturation, the 

 reduction division. 



The fulfilment of this prophecy by a host of different observers 



FIG. 89. Middle and end phases of mitosis. G, Metaphase showing the 

 longitudinal split of the chromosomes; H, the end phase or anaphase with the 

 daughter chromosomes separating, between them the inter-zonal fibers (if); 

 the centrosomes are divided in preparation for the next following mitosis; I and 

 /, final stages in daughter nuclei formation and division of the cell; n, the dis- 

 carded nucleolus. (From Wilson.) 



was a remarkable justification of the imagination in science. 

 The reduction division in some form or other, often complicated 

 and atypical, was revealed in type after type of animals and 

 plants until today it is generally if not quite universally accepted 

 as a typical phenomenon of maturation. 



