522 



tides all of about one size and fairly equally distributed throughout the 

 cytoplasm. It would seem as though the fat-particles after traversing the 

 epithelial cells were passed on in the first instance to the subjacent con- 

 nective tissue fat cells and there stored up until their removal is effected 

 by leucocytes. Only the hyaline variety of leucocyte was observed in the 

 intercellular spaces of the epithelium. With regard to these appea- 

 rances of fat absorption, it is of great interest and importance to find 

 that they occur in both sea and river salmon, including those whose 

 genital products are almost mature. For example , in the case of a fe- 

 male salmon captured in the River Don on November 11th, 1897, in 

 whose ova the yolk spherules had already partially fused, we found 

 that a very extensive fatty deposit existed in the sub-epithelial tissue. 



The Condition of the Gut in Kelts. 



In kelts practically the same condition of matters exists as those 

 in the spawning salmon. From the fact that undigested food remains 

 have more frequently been found in their stomachs they seem to be 

 more voracious , and their digestive functions become somewhat more 

 active. 



The above are the most important points with regard to the walls 

 of the gut of the salmon to which I would at present refer. From such 

 results it may safely be concluded that river salmon though they are 

 not in a condition to feed voraciously as in the sea, still do feed oc- 

 casionally, much depending on climatic conditions such as the tem- 

 perature, density, and volume of water. The following facts summa- 

 rised from the above point to this: 



1) The presence of minute microscopic foreign particles in the 

 intestine. These are the indigestible remains of ingested food material. 



2) The occasional acidity of the stomachic mucous membrane. 

 [Both in sea and river fish it should be pointed out that the 



stomach when not digesting gives either a neutral or a 

 slightly alkaline reaction due to the presence of mucin.] 



3) The absence of any catarrhal conditions of the lining membrane 

 of the gut, as affirmed by Dr. Gull and. 



4) The activity of the epithelial cells. 



5) The presence of leucin crystals in abundance and of tyrosin in 

 the intestine, pointing to the decomposition of proteid through the 

 agency of the pancreatic juice. The accumulation of leucin and other 

 materials is due to the diminished fluidity of the bile and intestinal 

 juices, and to the lessened activity of the gut in general. 



6) The presence of crystals of carbonate lime in the intestine, re- 

 sulting from the ingestion of food materials containing limy structures. 



