JORDAN XIII 









^ --^«l^;t^^ 



^^r^w[$^*sf^ 



t'TH. 





.4* 







A 





^ : ' 



1. Transverse section of same 5-ciav enibrjo at a level 300 microns forward 



of section fig. 2, plate 3, through the cord of segregated germ-cells (A) 

 at left. The cord has made a linear connection with the overlving 

 visceral mesoderm and the germ-cells are migrating into it and mov- 

 ing medially. Photo, x 100. 



2. Section through abdominal aorta and adjacent masses of sympathetic 



neuroblasts, 150 microns behind section fig. 3, plate 6. The arrows point 

 to the primordial germ-cells among the neuroblasts. (A) aorta filled 

 with blood dorsallv: (h), hemoblasts separating from endothelium vent- 

 rallv. Photo, x 400. (Helly fixation; iron-hematoxylin stain.) 



