478 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



of intestinal bacteria contained in 1 c.c. of surface water. 

 The samples were taken at various times, so that it is 

 inadvisable to calculate a mean. They will, however, 

 give a fair idea of the approximate degree of pollution of 

 the water. 



Lune Estuary. 



23 June, 1912. 



A sample of mussels from the training wall at Bazil 

 Point. 



Five mussels emulsified in 250 c.c. of sterile water. 



1 c.c. of emulsion = 



(0-02 mussel) contained 53 intestinal bacteria and 1 colourless bacteria. 



80 „ „ „ 6 



48 „ „ „ 5 



60 „ „ „ 20 



80 „ „ „ 



Mean No. of intestinal bacteria per mussel = 3700. 



23 June, 1912. 



A sample of mussels from Crook Skear. 



Five mussels emulsified in 250 c.c. of sterile water. 



1 c.c. of emulsion = 



(0-02 mussel) contained 157 intestinal bacteria and 7 colourless bacteria. 

 150 „ „ „ 



146 „ „ „ 3 



117 „ „ „ 1 



82 „ „ „ 2 



Mean No. of intestinal bacteria per mussel — 6500. 



Water Analyses — 



1 c.c. of surface water contained — 



At Bazil Point. 



At a Pool on Crook Skear. 



77 



76 



86 



111 



90 



120 



88 



56 



70 



46 



Means are 83 



82 



intestinal bacteria per c.c. 





