256 ELEMENTS OF WATER BACTERIOLOGY 



SEASONAL VARIATION 



IN THE BACTERIAL CONTENT OF 

 OYSTERS 



(GORHAM, 1912) 



Date. 



- = I- " 

 (U.2 — 



Proportion of Five 



Oysters Showing 



B. Coli in 



I c.c. 0.1 c.c.o.oic c. 



Score. 



B Coli 

 Present in 

 Water in 



Tempera- 

 ture of 

 Water 

 C. 



Dec. 20, 1910 

 Jan. 14, 1911 



Jan. 25 



Jan. 27 



Feb. 10 



Feb. 28 



Mar. II 



April 14 



April 28 



May 12 



Jan. 7, 1911. 

 Feb. 10. . . . 



Feb. 28 



March 11..., 



April 14 



April 28 



May 12 



Jan. 25, 1911 



Feb. 10 



Feb. 28 



March 4 



March 11.... 

 March 14. . . . 

 April 28 



Dec. 22, 1910 

 Feb. 10, 1911 



Feb. 28 



March 4 



March 11.... 



April 14 



April 28 



Bed No. 8. Providence River 



Bed No. 44. Providence River 



Bed No. 204. Warren River 



Bed No. 205. Warren River 



I oc.c. 

 O.OI c.c. 



O.OI c.c. 

 O.OI c.c. 

 o 01 c.c. 



o" 



1° 

 0.75° 



2° 



8.25= 



11-5° 



Only three oysters used. 



