324 
TABLE I—coniinued. 
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.) 











na nm an nm 
3 Shes 8 S 
ss ss iS S* 
£ Se s: Se Ss 
* ._ = = 
ae as 28 es Ss 8s S= 38 
ok =8 28 os SS Bes oS 
eS Ss Ss Ss SS es SS 
n H a | & NS = S 
| | 
eareetiee <2 0 100 0) oO 0) 3,600 0 
SRS Oil elon ioe om 5,600 | 0 0. 0| 3,800 0 
Os ODS Sass ta om 7,740 | 0) 0 0 387 0 
We Gascon 0 1,600 0 0 0| 4,600 480,000 
leg ee oe 0. 800 0 0 0 800 60,000 
wea xe 0) 10,800 0 0| 3,600,000| 28,800 0 
ED ee ae 0 0 0) 0 200,000 
Mar tases 800° 8,800 | 0) 0 0 800 900,000 
CORRE es.) 400 | 8,800 0 0) 0 800 900,000 
SOF 5) Jers 1,200) 109,200 0 0 0 0 1,800,000 
AB ek 0) 221,600 60,000 0 0 0 10,800,000 
So IO OR ear ts 0} 320,600 0 0 0 200 900,000 
pre aS a 0} 166,600 0 200 0 0 1,800,000 
Cis SW) okies 100 | 17,800 0 0 0 0 0 
& Os woo be 0} 126,000 60,000 0 0 0 9,000,000 
26 Ieee | 0) 121,600 120,000 0 0 0 4,500,000 
May Sue aos | 0} 102,400 0 0 0} 3,200 3,600,000 
“NWO es wa ct 0. 38,400 0) 0 0 0 9,000,000 
Smee & | 0. 21,600 0 0/|% 3,600,000 0 14,400,000 
Oe AN 0) 1,400 0 0 0 200 360,000 
A oa 0 200 0 0) 60,000 0 180,000 
June 7.25... 0 Oo. 0 0 0 0 4,500,000 
Gs aie eae arg 0 0 0 0 120,000 0 7,200,000 
OS le Aone 0) 1,600 0 800} 7,200,000 0} 147;}600;000 
SaaS ena ae 0 800 | 0 0) 6,300,000 0 38,700,000 
} 
[rutya eo eee 0) 0 0 400} 1,800,000 0 1,800,000 
Clee Opens 0 1,200 0 300 900,000 0 10,800,000 
G1 accoe om 0) 0 800} 3,600,000 0 86,400,000 
Eee ane 0 0 0) 2,000) 3,600,000 9,200 42}300,000 
Mate" 20). noe 0 0 0| 12,800 600,000 800 18,000,000 
SO ae 0 0 0 800 3,600,000 0} 252,000;000 
St Gir tee on 0 0| 4,000) 3,600,000) 1,600 93,600,000 
oa eae te 0) 0 0} 3,200, 1,800,000 800 65,700,000 
SAO) 0 0 0| 8,800] 1,800,000} 1,600 18,000,000 
Sept. 6...... 0 0 0} 4,000) 5,400,000 | 800 16,200,000 
URLS hacen 0) 0) 0 0 0! 1,000 6,300,000 
Se AO sa 0 4,000 0) “1,500 0) 0 1,800,000 
en ee aie 0 1,600 0} 4,800) 3,600,000} 1,600 9,000,000 
Oct ae te. 0 0. 0 500 1,800,000 0} 11,700,000 
Lee ae 0 0 0 0 120,000 | 0 1,800,000 
es ee ae 0 0 | 0 0 900,000 0 2}700,000 
EL aaa ae 0 500 Oo on 0 0 5,400,000 
Nowe vali aoe 0. 2,000 0 0 120,000 0 1,800,000 
OR ae a | 1,000 16,000 0 0) 0 0 1,800,000 
ORs eee 0 9,000 | 0 0 0 0 0 
Re GYR a ese O 94,000 | 0 0) 1,800,000 0 5,400,000 
2) ae 4,500} 1,999,500) 1,320,000 0 0 0 3,600,000 
Dec. 6.....:| 13,500] 1,693,500] 2,280,000 | om 0 0 900,000 
ale eae 25090 | 78,000} 2,760,000 0) 0 500 2,400,000 
Oe 6,200) 2,764,800 900,000, 0) 0 0 0 
LF es aaa 800 395,200} 300,000. 0 0 0 2,700,000 
. | | 
Average...... 625 179,138 150,000 873)) 1,094,605 1,254 17,672,692 



