456 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



to a very restricted section of the population of Barmouth 

 would have to be carefully balanced before one could 

 venture to express an opinion as to the desirability of 

 this change. I do not know whether it is possible to 

 hold back the sewage now discharging from No. 3 

 outfall, by means, preferably, of septic tanks and filter 

 beds, and then to turn out an effluent at some particular 

 state of the ebb tide, so as to avoid the fouling of the 

 upper part of the channel on the one hand, and the 

 bathing grounds on the other. This, also, is largely a 

 question of the same nature as that indicated above. 

 The success of this procedure would also imply the con- 

 scientious working of the regulations with regard to the 

 liberation of the sewage. 



There remains, now, the question of the practic- 

 ability of constructing a pond or tank near high water of 

 neap tides, and at some convenient part of the estuary. 

 This is a question which, naturally, would have to be 

 submitted to an engineer before the Committee could 

 satisfy themselves that the suggestion is likely to be 

 successful. It is a matter of expense largely, but the 

 purity of the water which would be used to fill the tank, 

 and also the convenience of the fishermen, would also 

 have to be considered. At first sight, the little island 

 opposite Barmouth, Ynys-y-Brawd, seems to be suitable, 

 but this island consists largely of sand, which is 

 evidently shifted by being blown by the wind. There 

 are breakwaters at either end of it, so that a considerable 

 amount of sea must sometimes be experienced on its 

 windward side. Whether or not it would be possible to 

 make a tank on the landward side, I do not know. It 

 does not seem likely that a tank could easily be made 

 anywhere seaward from the harbour, and although the 

 shore opposite Barmouth, Penrhyn Point, might have 



