324 
TABLE I—conitinued. 
ORGANISMS PER CuBic METER IN PLANKTON OF ILLINOIS RIVER IN 1898. 
(An asterisk at head of column indicates that all entries in it are based on 
filter-paper collections.) 
~ Z a Fei) 
3 S g 3 
Ses) 38 Ss Sx 
= A S83 s3 Ss 5 
1898 Rx 38 38 ZS SS 8 zs 
58 =s <5 £8 £8 S's £8 
Yj eal Y w w w w 
ee 0 100 0 0 0| 3,600 ee) 
Zana 0 5,600 0 0 0| 3/800 0 
Ds awe 0 7,740 0 0 0 387 0 
BES: 0 1,600 ) ny) 0| 4,600 480,000 
aaa ra ae 0 800 0 0 0 800 60,000 
ESE Ae: 0 10,800 0 0} 3,600,000} 28,800 0 
DOR 0 0 0 0 200,000 
feist? 800 8,800 0 0 oO 800 900,000 
Darien 400 8/800 0 0 0 800 900,000 
iB ee 1,200 109’ 200 0 0 0 0 1,800,000 
ae: 221/600 60,000 0 0 0}  10}800;000 
Doane 0 320,600 0 0 0 200 900/000 
cepa 0 166,600 0 200 0 0 1,800,000 
TTP nek 100 17/800 0 0 0 0 0 
LO eee 0 126,000 60,000 0 0 0 9,000,000 
D6 0 121/600 120,000 0 0 0 4'500,000 
Bee 0 102,400 0 0 0| 3,200 3,600,000 
LOE es 0 38/400 a) 0 0 0 9/000,000 
ite eer 0 21,600 0 0| 3,600,000 0|  14,400;000 
Bt Mat 0 1/400 0 0 0 200 360,000 
Et wee eae 0 200 0 0 60,000 0 180,000 
ee 0 0 0 0 0 0 4,500,000 
Paar es 0 0 0 0 120,000 0 7°200;000 
Tiga dete 0 1,600 0 800| 7,200,000 0| 1477600;000 
Dereeey 0 800 0 0! 6/300000 0| 38,700,000 
ee 0 0 0 400} 1,800,000 0 1,800,000 
Tere ne 3 0 1,200 0 800 900/000 0} 1058007000 
Osa aa 0 0 0 800 3,600,000 0}  86,400/000 
De ears 0 0 0| 2,000} 3/600,000| 9,200}  42/300;000 
Deas ete 0 0 0} 12,800 600,000} ~ g00|} 18,000,000 
Cea: 0 0 0 800} 3,600/000 0| 252,000,000 
ry eee 0 0 0} 4,000) 33600;000| 1,600}  93/600,000 
ae 0 0 0}; 3.2200] 1/800/000 800} 65,700,000 
ZOE ae 0 0 0} 8/800} 1/800/000| 1,600]  18;000;000 
On 0 0 0} 4,000| 5,400,000 800 16,200,000 
CaN 0 0 0 0 0| 1,000 6 300,000 
Ri eee 0 4,000 0| 1,500 0 0 1'800/000 
Dene 0 1600 0] 4°800| 3,600,000] 1,600 9'000;000 
Borate’, 0 0 0 500| 1,800,000 0 11,700,000 
dienes 0 0 0 0 120/000 0 1/800;000 
18 eer | 0 0 0 0} 900,000 0 2'700/000 
i ae 0 500 0 0 | 0 0 5’ 400,000 
eae 0 2,000 0 0 120,000 | 0 1,800,000 
Sete 1,000 16,000 0 0 0 0 1'800/000 
Leer 0 | 97000 | 0 0 0 0 0 
Doane 0 94/000 0 0} 1,800,000 0 | 5,400,000 
POA eins 4,500} 1,999'500| 1,320,000 0 0 | 0 3/600;000 
Bits th nan 13,500} 1,693,500} 2,280,000 0 | 0 0 900,000 
113 aerate 2'000 78/000 2/760/000 | 0 | 0 500 2,400/000 
Tce 6/200} 2,764,800 900/000 0 0 0 0 
Di ae hy 800 395200 300,000 0 0 0 2,700,000 
| | 
Average...... 625 179,138 150,000 | 873| 1,094,615] 1,251] 17,672,692 
