PLATE 6 



EXPLAXATION OF FIGURES 



23 Vacuolated liver cell membrane, a few endothelial cells; 6 day culture, 

 explant from 8 day embryo; Zenker, iron haematoxylin. X 660. 



24 Isolated liver cells. 4 day culture, explant from S day embryo; osmic 

 acid vapor, hemateine. X 1320. 



25 Isolated liver cell highly vacuolated, few mitochondria in the meshes 

 between vacuoles. 6 day culture, explant from 9 day embryo. X 1320. 



310 



