466 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



of pollution at that time was not such as need cause 

 alarm, particularly in view of the probability of the 

 improvement of the sewerage scheme of the Borough. 

 Since then, however, Dr. Bulstrode has visited the 

 district in question, and has reported at some length on 

 its condition. Further, there are important changes, 

 both in the sewer outfalls, and in the situations of some 

 of the mussel beds and sand-banks. It is therefore 

 necessary to re-consider the whole question of the 

 liability of these mussels to sewage contamination. 



The situations of the main mussel skears and sand- 

 banks are shown on Chart II, but since it was impossible 

 to make a detailed survey the positions of the various 

 beds and banks are only shown approximately. It is 

 hoped, however, that the sketch chart is sufficiently 

 accurate to give a fair idea of the risks of contamination 

 to which these shell-fish are exposed. 



The population of Morecambe is, of course, a very 

 variable one. It may be taken as about 11,000 normally, 

 but there is a very considerable influx of visitors during 

 the holiday season, and it is obviously difficult to estimate 

 this. When the sewerage scheme, now in operation, was 

 designed, it was intended to cope with a population of 

 about 60,000 people. 



Four sewers now discharge into Morecambe Channel 

 and Ring-hole. One of these (No. 1) conveys treated 

 sewage from the septic tank installation : this discharges 

 into the sea at the point shown, not far from the Skear 

 known as " Seldom Seen." The outfall No. 2 is that 

 referred to in my former report as the " Midland 

 Culvert": it is very much now as it was in 1906. 

 No. 3, the " Queen Street Sewer," has been discontinued, 

 and the sewage formerly discharged by it is now being 

 diverted into the main system. No. 4, the "Carton 



