104 GERM-CELL CYCLE IN ANIMALS 



Von Berenberg-Gossler (1912) considers the "Netz- 

 apparat" in the primitive germ cells of the chick of 

 particular importance (Fig. 31, C), comparing it 

 with the "wurstformige Korper" described by Hasper 



FIG. 32. Diagram to show the history of the germ cells in the embryo 

 of the guinea-pig, g.ep = germinal epithelium. (From Rubasch- 

 kin, 1912.) 



(1911) in Chironomus (p. 108, Fig. 33). The ap- 

 pearance of this structure in " Keimbahnzellen " 

 is thought to be due to the long period during which 

 these cells do not divide. Duesberg (1912), however, 

 after an exhaustive review of the literature on this 



