ORIGIN OF PRIMORDIAL GERM CELLS 



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Fig. 11 Portion of transverse section through a 21 somite chick embryo. 

 Meves' fixation and Meves' iron-hematoxylin stain. X 1125. pr.o., primordial 

 germ-cell; sp.m., splanchnic mesoderm; bl.v., lumen of blood vessel. 



Fig. 12 Portion of a transverse section through a 19 somite chick embrj'o. 

 Meves' fixation and Meves' iron-hematoxylin stain. X 1125. pr.o., primordial 

 germ-cell; bl.c, blood cell; bl.v., lumen of blood vessel. 



