SEA-FISHERIES LABORATORY. 355 



Mr. A. Scott and I landed from the " John Fell," met 

 Mr. R. Jones, and saw the remainder of the sewer outfalls, 

 and took further samples of mussels and sea-water. 

 Finally, on October 30th, I visited Llandudno and saw 

 the sewer outfalls there. I am obliged to Mr. Delamotte, 

 Surveyor for the Borough of Conway, and to Mr. W. 

 Little, Sanitary Inspector for Llandudno, for much 

 assistance with regard to the inspection of the sewer 

 outfalls. 



The results of these visits, and those of the analyses 

 made, show, I think, that there is some considerable 

 degree of pollution in the mussels of the Conway Estuary, 

 both from the river between the Bridges and Deganwy 

 and from the Scars below the latter locality. The 

 pollution is not excessive, and is far less than that found 

 in mussels from some other places in the Lancashire and 

 Western Sea-Fisheries District, as, for instance, Egremont 

 in the Mersey; though it is greater than in some other 

 mussel areas, as for instance, Moreeambe. The area over 

 which the mussel beds and the sewer outfalls are distri- 

 buted is a comparatively small one, and the pollution is 

 from crude sewage and is of recent origin. It is probable, 

 then, that even the limited degree of contamination of 

 these shellfish, which has been observed, is of some 

 significance. 



I do not think that, on the present evidence, the 

 pollution can be regarded as so dangerous as to necessitate 

 drastic measures. To justify interference with this 

 particular industry, topographical and bacteriological 

 evidence, indicating more serious pollution, would be 

 required. It is also an insufficient statement merely to 

 say that mussels derived from (say) the estuary of the 

 Conway had produced enteric fever in (say) Manchester. 

 All other possibilities of contamination between the date 



