444 The Pancreatic Ducts in the Dog- 



verse sections of clogs. The ducts were studied by dissection of fresh, 

 of hardened and of macerated material; in sections; and chiefly by 

 celloidin corrosion preparations. Casts of the duodenal parts (within 

 the wall of the duodenum) of the bile and pancreatic ducts are made 

 by ligating off tlie part of the bowel which receives the ducts, filling 

 it and the bile-ducts with celloidin solution injected via the hitter, 



Fig. 1. — Pancreas of the dog with the parts brought into one plane. A B, omental 

 or splenic portion, which lies nearly in a frontal plane and of which the expanded 

 concave free end was applied to the left kidney ; A C, epiduodenal or basal portion ; 

 C D, duodorsal portion. ACD, duodorsal division of Owen's description ; this part 

 lies nearly in a sagittal plane. E, branch from the arteria meseuterica superior cross- 

 ing the left-hand surface of the pancreas on its way to the duodenum. Ff lobe which 

 is shown enlarged in Fig. 2. 



then injecting the pancreatic ducts via the main duct within either the 

 caput or the cauda pancreatis. These casts represent approximately 



formalin may be diluted one-half with water and the last half of the solution may 

 have starch or plaster of Paris and carmin added to it, giving a beautiful arterial in- 

 jection. The abdominal viscera of the dog are so mobile that the animal should be 

 placed in the ventral position before the injection, if the natural topography is to be 

 studied. For the purposes of experimental operations done with the animal in the 

 dorsal position, the topography of the organs in this position should be studied in 

 material hardened with the animal on its back. 



