SEA-FISHERIES LABORATORY. 465 



a possible admixture of the diluted sewage which had 

 previously ebbed down Barrow Channel. But by this 

 time the sewage must have become so enormously diluted 

 that its effect on the pollution of the shell-fish must have 

 become quite negligible. 



We see, then, that the chance of sewage from 

 Barrow Channel, the most important source of con- 

 tamination, is very remote. On the other hand, the 

 chance of pollution from Ulverston is very remote on 

 account of the distance of the sewer outfall. There 

 remain the three sewers from E-ampside : now the 

 volume of sewage discharged from these outfalls is very 

 small, and this liquid, with some land water draining 

 from various " becks," runs down a fairly large and deep 

 gutter not far from the training wall, and some distance 

 from the mussel bed. This empties into the sea to the 

 south-east of Eoulney Island. 



The consideration of this mussel bed is rather 

 important, not only because it may be the source of an 

 important public food supply, but also because the 

 sources of contamination are such as can easily be 

 reckoned with. We see that it is most unlikely that the 

 shell-fish can be polluted to a significant extent. Yet it 

 is quite certain that bacteriological analysis will indicate 

 some degree of contamination, and the only possible 

 conclusion is that this is such as may safely be 

 neglected. 



(2) The Morecambe and Heysham Mussel Skears. 

 (Chart II). 

 In October, 1906, I reported on the results of some 

 inspections and analyses made by Mr. A. Scott and 

 myself with respect to the Morecambe and Heysham 

 mussel beds ; and came to the conclusion that the degree 



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