702 JOHN BEAED, The germ-cells. 



Fig. 43, 454/12, 2 r. 6 and 7 t; Fig. 45, 454/10, 3 r. 8 t; 

 Figs. 46 and 47, 454/9, 2 r. 9 and 10 t, and Fig. 48, 419/6, 

 2 r. 17 t. 



Figs. 49 and 50 show germ-cells from the "germinal cavity" in the 

 preembryonic period (No. 434). They demonstrate the duplication of 

 the nucleus. The yolk is not represented. 



Fig. 51. A section through a group of germ-cells lying just out- 

 side the pericardium. 14 mm. 634/1, 7 r, 38 t. 



Fig. 52 A — H. The germ-cells, or their forerunners, shown in 

 Fig. B, p. 655. Embryo No. 691, 2.7 mm. 6 r. 



