TABLE I—continued. 
o27 
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.) 













* = 
8 Ss 
| = ~n = s n 3 = 
1898 =o eS as ss Ses g 8 
28 SS $3 Ss ae $8 ~ 3 
85 35 5 S88 es | §&s s8 Ss 
S g SS OY Ss O& o& 
Si. ate Ao & = = a a 
Ait cet: 300 80,000 300 0 6,580 | 0 
Diletta 300 40,000} 28,800 0 49,240 0 
TS eae 58,437 O| 11,997 0 126,603 0 
Chote ae 5,900 0} 1,000 0 11,496 0 
Seer: 8,000 0 800 0 14,160 0 
LSS caer 5,200 0 800 0 31,040 0 
DORs ce 15,795 | 720,000 0 0 48 ,649 0 
ere coe: 10,000 0 0 0 20,400 400 
Se crt 8,400 0 520 0 29,200 800 
i eee 33,200 0 1,000 0 103 ,940 400 
DO Re eee 41,600 60,000 80 0 185,520 400 
DO has a Ate. 30,400 0 0 115,880 5,020 
Ged ae 20,500 0 20 300 0 84,820 1,800 
ie ae 20,100} 900,000 0 200 0 54,540 0 
TOR a tt 453,600 | 0 0 400 0 749 ,000 0 
WSs seu we 614,400 0 0 12,800 0| 2,892,360 4,800 
lenaehee 736,000 0 0} 720,000 0} 5,247,800 0 
NOhaae cae 78 , 400 | 0 0| 24,000 0| 2,663,400 200 
Ridin Secu s 72,000 0 0 10,400 800| 1,465,500 800 
DAS een. 74,200 0 0 400 0 196 ,020 3,200 
BU oe cist: 61,200 0) 0 400 200 180,760 18,800 
ee ,499,200} 60,000 0 14,400 0 903 ,000 392,000 
fan oe: 532,800 0 0| 104,000 0 639,600 1,600 
Die iens 195,200 0 0 74,400 0| 2,601,200 3,200 
DENS eee 45,600 | 3,600,000 0 33,600 0} 1,118,400 0 
Serena 13,600 0 0 4,800 7,200 153,000 800 
fee xe} 35,600 | 2,700,000 0 5,600 400 184,500 0 
OY 24,000 | 0 0 2,800 946 ,080 0 
Doves, s¢ 2,000) 120,000 0 3,600 370,200 0 
Da eee 23,200 | 1,800,000 0 95,200 1,294,240 0 
Oh as 8, 400 0 0 4,800 782,720 0 
GSS anes 20,000 0 0 8,800 0 935,380 0 
DB On bee el 26,400 0 0 5,600 1,600 696,180 1,600 
BOR Mahe! 51,200 0 0 800 0 435,080 1,600 
(Sacre 13,600 0 40 | 0 0 0 422,840 0 
NBS cee 49 ,000 0 120 2,000 0 0 197,960 0 
DOS aN: 34,500 0 0 20,000 0 0 475,860 1,000 
Ti eae 92,800 0 200} 22,400 0 0| ‘1,792,700 14,400 
ANE fet 23,000 0 0 1,500 0 0 105,020 2,580 
ihe tree 23,000 0 40 500 0 0 122,000 2,000 
1S te 47,000} 900,000 0 1,000 0 0 159,200 0 
Doras 27 23,000 0 0 0 0 0| 1,048,620 
eee 12,500 0 60 | 0 0 0 156,300 0 
See. 70,000 0 0 0 0 0 147,780 0 
See 35,000 0 100 0 0 0 180,600 0 
DORs 2,000 0 0 0 0 0 128,400 0 
DOK eee 2,000 0 0 0 0 0 | 66 ,000 | 0 
Ca 40 0 0 0 0 0 64,280 | 0 
eee 300 | 1,080,000 0 0 0 0 159,740 0 
DO mag 200} 120,000 0 0 0 | 0 191,320 0 
2) ae ree 200| 120,000 0 0 0 0 50,540 200 
Average...... 101,024| 255,769 | 882| 22,590] 332 | 592,416 | 

