of the Salmon in Fresh Water. 35 



albumin digested by trypsin. Of the five which digested most albumin 

 by the action of the appendical extract, four only were used for the 

 estimation of peptic digestion. These four give an average amount of 

 albumin digested by the extract from the appendages of 55'7 per cent., 

 and by the gastric extract of 21*75 per cent. This last figure is much 

 above the mean of 11-1 per cent, obtained from the total number of 

 estimations of the peptic power. 



The smallest amount of albumin digested (12- 6 per cent.) was 

 obtained from the action of the intestinal extract of a kelt caught 

 in July, the next from that of an ascending fish in the same 

 month (16'9 per cent.). The average percentage of albumin digested 

 at the ordinary temperature by the extracts of the pyloric appendages 

 was 48-13 per cent. This fact shows that a very considerable proteo- 

 lytic power was still possessed by the secretion of the gland opening 

 into the appendages. Dr. Gulland has shown that this is of the nnt-urn 

 of a pancreas. 



Although the intestines were invaria.bly found to be empty, save for 

 some mucus, the glandular elements in their walls, especially those in 

 the mucous membrane of the appendages, contained a much more 

 active zymogen than the gastric glands, and ^ were able to afford a 

 ferment, on the addition of an alkali, which was capable of a considerable 

 amount of work. 



