of the Salmon in Fresh Water. 



55 



nine fish, one of them from the upper water ; the gastric. contents in six 

 fish, one of them from the upper water in November 1895 ; and the 

 intestinal contents in eight, with three from the same part of the rivers 

 one in July and two in November. The fish included in this class 

 may be divided into : 



(d) Bacillus Coli Communis. 



Among the growths which did not liquefy gelatine there were a 

 number closely resembling in the form of their colonies and in their 

 microscopic appearance the Bacillus coli communis. It is now recognised 

 that several organisms may be included under this name. The 

 individual differences between the varieties are very slight. 



The Bacillus coli communis was found in. the ossophagus and in the 

 stomach in six fish, in the intestines in seven. In two of these (which 

 were caught at the river mouth in July) the organism was detected in 

 each section of the digestive canal. In many of these other organisms 

 were also present. 



All the fish from which this bacillus could be cultivated from the 

 (esophagus were caught during July and August ; and, in four of the 

 fish caught during these months, from the stomach and intestine. The 

 other occasions on which it was present were diiring the later months 

 except for one in March. Only four of the fish came from the upper 

 waters. 



3. SPECIAL CHARACTERISTICS OF SOME OF THE MICRO-ORGANISMS 

 CULTIVATED FROM THE CONTENTS OF THE ALIMENTARY CANAL. 



(a) Organisms which Liquefy Gelatine. 



The varieties of bacteria capable of liquefying gelatine which were 

 found in the mucus of the alimentary canal may be divided into one or 

 two types : 



1. Bacilli liquefying gelatine in " stich " cultures, and producing a 



