436 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



REPORT ON SOME MUSSEL BEDS IN 

 LANCASHIRE AND NORTH WALES AS 

 REGARDS THEIR LIABILITY TO SEWAGE 

 CONTAMINATION. 



With Charts. 



By Jas. Johnstone, B.Sc. 



Contents. 



1. Introduction , 



2. Bacillus coli and its significance ... 



3. Methods of Analysis ... 



4. Epidemiological Evidence and Standards of Impurity., 



5. Description of the Mussel Beds and Sewer Outfalls 



6. Bacteriological Analyses 



7. Conclusions 



INTRODUCTION. 



PAGE 



436 



438 

 445 

 455 

 461 

 476 

 483 



At the November meeting of the Scientific Sub- 

 Committee I was asked to prepare a report on the 

 principal mussel beds in Lancashire and Wales. This 

 I now present with regard to some of these beds only : it 

 has been impossible in the time to make a complete 

 investigation of all the mussel areas, and indeed this 

 report could not have been ready had not Dr. Jenkins, 

 Mr. Scott and I already examined many of these mussel- 

 bearing grounds. In June last we visited the Conishead 

 Priory Scar ; in July Mr. Scott and I visited Morecambe 

 and Heysham; in the same month Dr. Jenkins and I 

 inspected the Lune mussel beds ; in November I visited 

 the Estuary of the Wyre, where I met Mr. T. R. Bailey, 

 Port Sanitary Inspector of Fleetwood, and saw the 

 mussel beds at that port, and at Wardleys. In November 

 Dr. Jenkins and I again visited Morecambe and saw 

 much of the conditions there. Also, in June, Mr. Scott 

 inspected the Roosebeck mussel bed and took samples, 





