326 



Beard, Heredity and the epicycle of the germ-cells. 



the present case brought about an investigation of the early history 

 of the germ-cells without associating with this inquiry any ideas con- 

 cerning spore-mother-cell formation or alternation of generations. 



Only when the work was practically ready for publication, and 



Fig. 1. 



:r 

 o 



7} 

 O 



IV! 



O 



o 



o 



I 



ts 



Ci 

 n 



SPERMATOGENESIS E.G. 

 PALUDINA. 



when a proper survey of the results had been obtained, by drawing 

 them up in diagrammatic form, as shown in the table, the full force 

 of the discovery became apparent. The formation of the primary 

 germ-cells in the skate - - and in all probability in every other Meta- 

 zoon corresponds broadly to the genesis of spore-mother-cells on 

 the asexual generation of a plant, the sporophyte. 



