18 SHELLFISH CONTAMINATION FROM SEWAGE-POLLUTED WATERS. 



TABLE 3. Results of the bacteriological examination of sea water over oyster beds Cont'd- 

 COLLECTED FROM LOCALITIES SHOWING PROBABLE POLLUTION. 



These results, as a whole, indicate that in this case the deep water 

 was more polluted as regards B. coli and B. enteritidis sporogenes than 

 the surface water over the same locality. 



TABLE 4. Bacteriological examination of water collected over a distance of about 200 

 miles, a portion of which covers extensive shellfish grounds. (September, 1909.} 



OVER OYSTER BEDS. 



UPPER LIMIT OF OYSTER BEDS. 



a Bubble. 



