PLATE 19 



EXPLANATION OF FIGURES 



81 Section through the liver of the embryo from which figures 62, 63, 64, and 

 75 are made. Erythrocytes are seen in various stages of foi'mation from mesen- 

 chyme cells. 



ABBREVIATIONS 



Erthbl., erythroblasts Erth., erythrocytes 



168 



