328 
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.) 









aS 
28 2.2 8 s g 
1898 B8 as 8 es | 5 2 g es 
CS 2s a ar) = 8 xs & 8 $ 
82 S 3s se | ss) 82 as SS 
Sas SS ea) ES Ss Ss raise = 
S S* e a Se Ss a x 
Upteecdlil 2 pee 0 0 400 0 0 400 6,180 0 
a ars 0 0 45,100 0 0} 44,500 4/040 0 
ep Pontes 0 0 90,171 0 0| 89/379 35,271 0 
ebm Steen 0 0 3,800 0 0 3,800 7,696 0 
Gar ae ea 0 0 6/800 0 0 6/800 7.360 0 
Us Sree 0 0 18/000 0 0| 27,000 12/240 0 
Ue aDD epee ae 0 0 25,272 0 Ol 25/272 Deo 0 
Mar Miae oe. 0 0 1,600 0} 400 800 18,320 0 
an, eet 400 0 4/040 0 40 4,000 23/960 400 
a See 0 400 22; 160 80| 400] 19,200 80,980 40 
UID DE Cece: 0 400 10/440 0 40} 10400 174,680 400 
OD olen ecg 0 20 1;620 0 20 1,600 109240 200 
Noe 05) eee 0 | ny) 1,100 0 0 1,100 81,920 600 
Cle Sie ne oe 0 0 960 0 60 800 53/480 600 
On tie 0 400 3,300| 400] 100] 16,000 745/300 2,000 
EE ate a 0 3,200 4/640 0| 640 3}200| 2,889,720 3/200 
May 3...... 0 0 16,000 0 0} 12,800] 5,231,800 22,400 
aslo Mes 0 200 14/400 0| 1,600} 11,200] 2,647,200 35,600 
Ce pan ene } 0 800 20,800 0| 6,400} 10,400] 1,438,300 22/400 
Lae Atte 0 3,200 1,040 80| 520 400 191,780 4/000 
BS See Teds 0 18/600 880 80} 200 600 161,080 1/400 
Seamete7 or a 0 392,000 800 0} 800 0 507,000 1,600 
Ss ee 0 1/600 600 0} 400 200 637,400 800 
IGS ae a 3,200 0 1,100 0} 300 g00|} 2,593,600 0 
Ge bee AO 0 0 1,900 0} 800 300} 1,112/500 0 
pele ese 0 800 2,480 80 1,600 800 146,920 0 
an eee 0 0 4'800| 400] 2,000 2,400 178,100 0 
SAO RS | 0 0 2;760| 1,600] 360 800 933,320 0 
EAGT eae | 0 0 120 0 0 60 268,480 0 
ING Diet 0) 0 1,400 0| 560 40, 1,260,840 0 
Se 9 OS tans | 0 | 0 1,200 0 0 12,000 775,920 0 
ean Ghee 0 | 0 4/120 0} 120 4;000 907,260 0 
2s) he oe 1,600 0 5,720 0 60 5,600 671,260 0 
Us Ome 1,600 0 4/080 0 80 2;400 415,000 0 
Sept. 6...... 0. 0 9,640 | 2,400 40 4,800 413,200 0 
ies gees 0 0 21,000} '500| 1,500] 17,500 171,960 0 
ee One oe 1,000 | 0 6,000] 1,500| ‘500 3/000 460/360 0 
TT eee nee 14/400 0 13/300) 8,000| 300 4°800| 1,744,200 0 
Otte LAs ss: 2,500 0 2,280| 2,000] 120 160 97,150 0 
Ue Ae eegeet 2/000 | 0 2/000} 1,000} 500 500 115,500 0 
Tee 0 0 540 0 40 0 188; 150 0 
OG (Aa ie 0 0 3,500 0| 1,000 2,500| 1,045,120 0 
| 
Novena 0 | 0 3,060 0 60 3,000 152,680 0 
Gi eae aa 0 0 1:180| 120 60 1,000 146,600 0 
i is maes <6 0 0 100 o0| 100 0 180,500 0 
Cp 0) 0 400 0| 400 0 126,000 0 
CTO WES ay: 0 0 0 0 0 07 66,000 0 
Dec Gneeeee 0. 0 | 20 0 | 0 20 | 64,260 0 
A east 3 lk ee 0 oO. 600 0 0 600 159/140 0 
aye eae 0 om 0 0 0 0 191/320 0 
a en 200 0 20 0 20 0 50/120 20 
| | i} 
Average...... 517 | 8,108|™ 405,983) 351| 425 6,688 571,611 1,839 





