of the Salmon in Fresh Water. 

 TABLE I. 



I am indebted to Mr. Archer for the following observations on this 

 point, made upon a very large series of fish of different lengths : 



TABLE II. 



The difference is thus less than 1 per cent. 



METHOD OF INVESTIGATION. 



It was impossible for a single individual to conduct so extensive an 

 investigation as that contemplated, and I was fortunate in securing the 

 co-operation of various workers in the Research Laboratory of the Koyal 

 College of Physicians. 



The following scheme shows the general plan of the investigation and 

 the manner in which it was apportioned among the various workers : 



How far may the Salmon examined be considered typical of their 

 respective classes ? By Walter E. Archer, Inspector of Salmon 

 Fisheries. 



The Source fn m which Salmon obtain nourishment and the Exchange of 

 Material in their Body during their sojourn in Fresh Water?- 



A. The Power of the Alimentary Canal to Digest and Absorb Food 



1. Changes in the structure of the lining membrane of the 

 alimentary canal and in the various glands. By G. Lovell 

 Gulland. 



