154 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
22 June, 1915. Neap tides. Half-flood tide. 
Present in 1/50 part of a mussel (5 estimations) 
1, 1, 0, 2, O sewage-bacteria. 
22 June, 1915. Neap tides. Low water. 
Present in 1/50th mussel (5 estimations) 
1, 1, 2, 0, O sewage bacteria. 
30 June, 1915. Spring tides. Half-flood tide. 
Present in 1/50th mussel (5 estimations) 
2, 1, 1, 1, 1 sewage bacteria. 
30 June, 1915. Spring tides. Low water. 
Present in 1/50th mussel (5 estimations) 
12, 7, 5, 12, 8 sewage bacteria. 
In none of these cases can I regard the amount of 
pollution indicated by the analyses as significant, and 
one must remember that the conditions will be materially 
improved by the alterations in the sewerage which 
I have suggested above. 
(3) Portmadoc. 
The situation with regard to the mussel fisheries at 
Portmadoc is rather different from that at Aberdovey or 
at Barmouth. The industry there has practically been 
stopped on account of the embargo laid on the mussels 
by several market authorities. It is a bigger industry 
than that at the other two estuaries, though it is very 
small compared with the great mussel fisheries of 
Conway and Morecambe when these were at their best. 
Some remedial measures are very desirable in the case of 
Portmadoc, especially this season when mussels appear 
to be unusually abundant in the estuary. The difficulty 
in dealing with this place is not only that of expense, 
but as Dr. Jenkins pointed out in his Report of June 
last, a harbour improvement scheme is being promoted. 
Further, a sewerage scheme has been suggested, and is 
apparently in abeyance in the meantime. In the 
circumstances of possible new sewers and.changed river 
