SEA-FISHERIES LABORATORY. 



349 



near the main sewer outfall 350 colon-like colonies were 

 counted on the plate made from 1 cc. The plates made 

 from '001 cc. and the lower dilutions were sterile. In the 

 case of the Ring-Hole sample 19 colon-like colonies were 

 counted in the plate made from 1 cc. and 5 from that 

 made from O'l cc. The lower dilutions yielded sterile 

 plates. 



These observations do not go very far, but they just 

 indicate that the dilution of the effluent and the crude 

 sewage is so very great that the bacteria present become 

 enormously dispersed through the sea. This is indeed 

 what one might expect from a consideration of the 

 topography and tidal currents of the locality. 



The results of these water analyses are shown on the 

 following table : — 



Bacteriological Analysis of Water Samples. 



Locality. 



Off " Great Out " 

 Skear. 



Off " Baiting-Knot' 

 " Ring-Hole " 



Above Sewer Outfall 



Amount 

 taken. 



I CC. 



I cc. 



I cc 



0"I cc 



0"OI cc 



I cc 

 •ooi cc 



Reaction in 



Bile-salt 



Broth. 



No. of " Colon- 

 like " Colonies 

 on neutral-red 

 agar plates. 



19 



5 

 sterile 



350 

 sterile 



