Figs. 2, 3 and 4 Wax reconstructions of parts of the liver, intestine, and ad- 

 jacent veins. X 30 diam. Fig. 2 Pig embryo: 10 mm. Harvard Embryological 

 Collection, Series 1698. Fig. 3 Human embryo: 10 mm. H. E. C, Ser. 1000. 

 Fig. 4. Human embryo: 11.5 mm. H. E. C, Ser. 189. Parted., Panc.v., dor- 

 sal and ventral pancreases. Ves.fel., gall bladder. 1". //., splenic vein. V. mes. 

 sup., superior mesenteric vein. V.v., trunk formed by the fusion of righl and left 

 vitelline veins. V.umb., umbilical vein. 



107 



