THE REDUCTION OF THE CHROMOSOMES 



237 



ANIMALS 



FIG. 89. The method of chromosome reduction according to Scheme B. 

 Explanation in text. 



Scheme B. The second of the two conspicuous interpretations was 

 advanced by Farmer and Moore (1903, 1905), and is essentially as 

 follows (Figs. 89-92) : In the early heterotypic prophase the reticulum 

 becomes more thready in structure and contracts into a tight knot 

 (synizesis). When this knot loosens up the chromatic material has 



