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GEORGE W. CORNER 



separated by teasing. When these nodules are dissected out and 

 studied under the microscope it is found that they are mostly 

 about 0.4 to 0.7 mm. in diameter; some are larger, and some 

 smaller, but the larger masses are greatly lobated, as if in the 



Fig. 2, A Biagraiii showing pancreas and ilu()<l(>nuni (dorsal view) of 150 mm. 

 pig foetus in which both arteries and duets have been injected; to illustrate the 

 point that the courses of the ducts and arteries are parallel in some part of the 

 pancreas but not related in others. D, duodenum; CA, coeliac axis; Spl, branch 

 of splenic artery supplying pancreas; sup, sup. pancreatico-duodenal artery; InJ, 

 inf. pancreatico-duodenal (from superior mesenteric); Dl, duct. 



Fig. 2, B Duodenum and pancreas of 20 mm. pig embryo, dorsal view (after 

 Thyng '08, slightly altered) showing the part taken by the two anlagen in the 

 formation of the pancreas. D, duodenum; VA, (light shading) ventral anlage; 

 DA, (dark shading) dorsal anlage; CD, common duct; BD, bile duct; DVA, duct 

 of ventral anlage; DDA, duct of dorsal anlage fmain duct in the pig). 



act of dividing, and the smaller ones are usually found in close 

 groups or intimately joined to larger nodules. From this fact, 

 and from other points to l)e mentioned later, it is fair to assume 



