SEA-FISHERIES LABORATORY. 89 



SUMMARY OF WORK FROM THE LIVERPOOL 

 LABORATORY. 



By James Johnstone, D.Sc. 



Shell-fish and Sewage Investigations. 



Only brief reference can be made to the various in- 

 spections, analyses, &c, that have been undertaken during 

 1916. 



The Mussel Fisheries. 



The Barmouth mussel purification tank was completed 

 in September, 1916. Serious difficulties were encountered, 

 and so far the tank has been worked in a provisional manner 

 only. 



In October a visit was made, and a series of experiments 

 were made to test the tank. I regard these as successful since 

 a considerable amount of cleansing took place. Nevertheless, 

 these were to be regarded as laboratory experiments carried 

 out with all care. The real test of the efficiency of the tank 

 is the results obtained* by the actual working process carried 

 on by the fishermen themselves. This has not yet been 

 satisfactory. 



Inspection by the Board of Agriculture and Fisheries. 



Dr. Jenkins and I met Dr. R. W. Dodgson, the Board's 

 Bacteriologist, at Barmouth, in November, 1916, and had 

 a conference as to the best way of working the tank. Later 

 in the year I met Dr. Dodgson at Conway, and saw the methods 

 of purification employed there under the supervision of the 

 Board. The experience obtained at Conway has been most 

 valuable, and we are greatly indebted to Dr. Dodgson for 

 many suggestions and much sound advice. 



Certain structural modifications of the Barmouth tank 



