SEWAGE CONTAMINATIOIS" OF OYSTER BEDS. 



215 



Table Y. — Anah/.'iis of vater samples collected over the liocl-n Point oyster grovnd. 



Table VI. — Anahis:is of water samples collected in Warren River. 



Date and station. 



Dextrose 

 fermented. 



Red colo- 

 nies on 

 litmus lac- 

 tose agar. 



B. coli. 



Other fecal 

 bacteria. 



October 8, won, tide falling. 



Station 1, surface tube . 

 t deep tube . . . 



2, deep tube ... 



3, deep tube . . . 



4, deep tube ... 



5, surface tube, 

 deep tube . . . 



6, surface tube, 

 deep tube . . . 



(«) 

 («) 

 («) 

 (a) 

 (a) 



"Not made. 



From the above data it is apparent that the riv^er after passing 

 Conimicut Point is comparatively free from sewage. B. coli was 

 found in onl}' two samples taken from this section, once in a sample 

 from station 1 and in one sample from station 3; both these samples 

 were collected at a very low tide, due to the change of moon. On the 

 other hand, it will bo noticed that nearly all the samples from the 

 Warren River gave tests of B. coli, but after the Warren River joins 

 the Providence River tliis organism soon disappears from the water. 



Thus between and 7 miles below the Fields Point sewer is another 

 area of water from which nearly all traces of pollution have dis- 



