a29 
TABLE I—continued. 
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.) 
1898 Sas 882 sss us 
Ss a8 SS 5 SS ais 
S8Es SI SES SUS 
<x x x a 
‘ba eal ieee oes 0) 0) (6) 0 
Sera et. 300 0 0 300 
TOS tae Noe 387 ) 1,661 2,048 
a or 500 0 100 600 
Co Genes ae 0) 0 80 80 
Se Ag fey 80 0) ny) 80 
SES eae 0 0 0 0 
Wikies Siete seer 400 0 80 480 
0, OC eaten 800 0 1,200 2,000 
Sia S ee pace 2,200 0 600 2.800 
Sees 3/200 0 800 4.000 
SEDO. gt so 2.600 ) 600 3,200 
Are toes 0 1,700 400 2,100 
ts et 1,800 0 400 2/200 
BIO ee 12,400 0| 2,800 15,200 
TS) eae 12800 121,000 4/000 137,800 
Wave 3) ts: 222,400 745 ,600 54,400] 1,022,400 
Oe es 134,400 790/400 220'800| 1,145/600 
pmplieet 91/200 295.600 48,000 434/800 
CONTI S Des 1/000 18/400 1/800 21,200 
a 1,400 9,200 600 11,200 
lic) ae 0 32,000 0 32,000 
cy ieee 0 28000 1,600 297600 
7 ee aaa 0 150/400 222’ 400 372/800 
CG.) a eae ) 48/800 117,600 166,400 
lvae. Sect. 0 2,800 7,200 10,000 
eae ae, a) 2.000 8000 10/000 
OOD Sa ae 0 2,000 15,200 17,200 
icy rn ae 0 0 1/200 1/200 
a 0 0 ) 0 
SAE OR ssh 0 0 0 0) 
a a 0 0 0) 0 
“aes nea 0 0 0 0 
caNES () es ) 0 0 0 
eT LGN ..,? 0) 0 0 0 
aa. rn. 0 500 0 500 
Cats ee 0) 3,500 8,500 12,000 
Sy a een 0 19,200 35,200 54,400 
Biers Fa ee 0) 4,000 2,000 4,000 
oy ce ee 0) 7/000 2000 9/000 
ae 0 17,500 7,000 24'500 
sen) S ae 500 9,000 19/000 28,500 
Novae eur 500 0 1,000 1,500 
0 eS eee 0 0 0 0 
Sg aN ae ) 0 0 0 
OC ee ae ) ) 0 ) 
US a 500 1,000 8,500 10,000 
Bese Pip i: 0 1,000 1,020 2,200 
Cie Rea as 500 1/700 5/100 7/300 
a) ee 0) 3/600 1,600 5/200 
PN ae es 0 200 0 200 
Average...... 9,421 44,540 | 15,432 69,165 
at S oa 
x 
oes 8 oes 
BES SS | gs& 
Sue == aes 
a x a 
0) 100 100 
100 0) 0) 
0 0 0 
300 0 10) 
0) (0) 10) 
0) 0 0 
0 0 0) 
0 (0) 0) 
1,600 (0) 0 
1,400 0) 0 
2,800 0 0) 
200 0 (0) 
600 0 0 
800 (0) 0 
8,800 10) 400 
57,800 10) (0) 
552,200 0 0) 
643 ,200 0) 0) 
160,000 0) 0 
7,200 0) 0) 
3,400 (0) 0 
3,200 0 0 
7,800 (0) 2,400 
148 , 800 9,600 8,800 
20,800 7,200 4,000 
1,600 800 400 
4,000 1,200 0 
5,600 4,000 0 
0 0) 0 
fy) 4,800 2,400 
0 2,000 4,000 
0 16,000 8,800 
) 9,600 3,200 
0 800 800 
0 0 0) 
0) 1,000 0 
6,000 4,000 1,000 
16,000 43 ,200 54,400 
500 2,000 500 
4,500 500 10) 
10,500 3,500 2,500 
7,000 13,500 5,000 
0 500 1,000 
0 0 0 
0 0} 0 
0 0 0 
500 0 0 
20 0 0 
1,800 (0) 0 
2,600 0 ) 
0 (0) 0 
32,358 2,390 1,917 
