342 WATER HYGIENE 
Chicago to prevent the pollution of this river. It was argued that the 
water supply of St. Louis was endangered. The testimony heard in 
Parts per Milhon Parts per Million 
fond 
cs ie @) 
al 
o nw 
Mississipp)-River 
Mouth of Tilnhows R, 
oa NN 
Mussissipp: River 
Grafton Mouth of Uhndis R. 
> 
Hf 
BERERRE 
& 
Pearl 
Beardstown 
Havana 
Copperas Cr, 
Peoria 
Chilieoth 
Henry Belew Tam | 
ATE 
| an 
Hennepin Hennepin aa 
Spring Valley | | 
Pera La Salle 
Starved Rock Starved Rock a 
Ottawa 
Marseilles Above Dax 
vtorie | | | 
Dresden | | | 
SECT 
Marseilles ae 7 ¢ 
\ 
wows | | | | | | ENG 
pate POD 
SS 
cj [wl | 
—— 
wm 
ced 
3. 
e 
3 
a 
ial 
| 
# 
fi 
Oe 
TEP 
oe 
Tere 
Lockport Ene 4 
mS 5 8 
oO mp Fk ob ps ® am wo & rn 
Parts per 7 Parts per 
Million Millian 
Fia. 65.-—Showing Dissolved Oxygen Concentration in Different Parts of the 
Illinois River. (From Illinois State Water Survey Bulletin.) 
this case has been summarized by Leighton (1907). Both sides of the 
case presented some very interesting opinions and data. Jordan (1900) 
who did valuable work for the defendants reported some of his data in 
