414 PROCEEDINGS OF THE CANADIAN INSTITUTE. 



ing at rest a question of long standing, although his statements were- 

 contradicted by Krukenberg 1 and confirmed by Nussbaum 2 . Cajetan 3 , 

 a pupil of the latter, studied and described the pancreas in Anguilla 

 vulgaris, Esox lucms, Trntta fario, Perca JtuviatUis and Gobitis 

 barbatula, and tests his results by digestive experiments in several 

 cases. 



There are no pyloric appendages in the cat-fish. In searching the 

 intestines microscropically a pancreas also is not to be found. I could 

 find no organ in Amiurus as that described by Brandt and Ratzeburg 

 as occurring in Sihirus. On the other hand, in endeavoring to find 

 the duct described in the last named fish by Cuvier, I discovered 

 one which but little answered to it, but which as I found afterwards 

 is the duct of the true pancreas. 



This pancreatic duct runs almost parallel to the ductus choledochus 

 and above it. The pancreatic duct is always the paler of the two, as 

 the other takes more or less the color of bile. Half way between 

 the intestine and the liver it divides into two or three branches, 

 which run above the arched portion of the ductus choledochus into 

 the liver substance along with the cystic ducts on both the right and 

 left side of the middle line. 



In the larger channel cat-fishes the duct is large enough to admit 

 the insertion of a canula for the purposes of injection, and by this 

 means the branching of the duct can be easily perceived. The finer 

 tubules, i. e., those of the gland proper, cannot be injected. 



If the interlobular branches of the portal vein be injected with some 

 material which will fill them to the exclusion of the finer branches, 

 and if a section of liver thus injected be made, in such a section we 

 can at once see the distribution of the gland tubules of the pancreas. 



They are found to be arranged some circularly, some obliquely and 

 some longitudinally about the interlobular vein, the arrangement 

 being so distinct as at once to mark them off from the surrounding 

 hepatic tissue. The cellular elements of these acini are light colored 

 when compared to the hepatic cells, and take a lighter or a darker 

 stain than those, according to the staining fluid used. 



Fig. 1 1 gives a view of such a section. It is there observed, as is 

 usual in other sections, that the gall ducts are to be found outside of 

 the pancreatic tubules, some of which are cut across. 



1 Kukne's Physiol. Untersuch. Bd. II. p. 385. i Loc. cit. s Loc. cit. 



