ge 
Issued April 19, 1911. 
U.S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF CHEMISTRY—BULLETIN No. 136. 
H. W. WILEY, Chief of Bureau. 
SHELLFISH CONTAMINATION FROM SEWAGE- 
POLLUTED WATERS AND FROM 
OTHER SOURCES. 
GEORGE WHITFIELD STILES, JR, 
In Charge, Bacteriological-Chemical Investigations. 
a 
¢ == So! 
f ti ree ’ 
& = nN 
<i oe 
oo ny Eke) 
is 5) Vie EAH 
feck NZ a 
a A AN em Bae 
=k 4 th 4 a 
Sa AM Wis =e 
SSRN 1 ¥y 
Sr f oye 
o 9 
RES 
Ig) . 
Yh. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
ROLE, 
