TABLE OF DETERMINATIONS OF COEFFICIENTS OF N 
ETS BY EMPIRICAL METHOD. 
apron aa i Enumeration—1 m.’ water Tan seer 
, Length! Gravity Method—24 brs, Centrifuge Plankton. 
Locality, etc. ‘Net |Haul = F 
BAG PDS of haul)"° ai Net |Pump |Coefficient} Net |Pump Coefficient Net Pump {Coefficient 
| 
3 ac Ss ilt. Synura and Copepoda. 
anaes Illinois River jom.| 2| 1 | 175 | .475 2.717 | .075 | 215 | 2.868 | 37 5771 57,931 1.533 ome si ynura an ee 
Dec, 30] Illinois River | 30m.| 2 | 1 | .160| .760| 4.750| .o80 | .350| 4.376 | 119150] 243181 | 2-041 | Much silt. Synura, Synchata, and Copepoda, 
Le 4| 1 | .325 | .850 2.615 | .140 | .285 2.143 | 141,490 | 458,057 3.468 | Small amount of flocculent debris. Polymixic 
4| 2 | .235 | .g00 3.617 | .ogo | .310 3.333 | 84,160 | 535,507 5.819 | plankton, Many nauplii. Enlomostraca, Rhi- 
| | 4 |-ave |jca8o || gute) 13¢086)|| e115) «wen 2.609 | 112,830 | .....-- 4.340 | zopoda, Kotifera, diatoms,and Protophyta presen, 
June 16] Quiver Lake | 30m. |——|- ss eal =s ; 148 
5 | 3 | -625 | .750 1.360 | .280 | .255 1.071 1951990 439,054 Eh 
S| 4 | -410 | .g0o 2.073 | .180 | .350 1.667 | 164,840 | 566,216 2.971 
2 | av. | 520| .850 | 1.635 | .230 | .300 | 1-304 | 180,410 | 489,708 2.604 
LL 5 Small amount of debris. Polymixic plank 
July9 | Matanzas Lake | 30m. | ANAT .365 |1.300 3.562 | .180! .540} 3.000 96,891 | 421,175 4. B47 | Entomostraca, Rotifera, ideibods, Peaiitiyta 
a i eee F| 1 | 0550 [1.225] 2.227 | .200| .420| 2.100] 117,898 | 239,744 | 2.034 | polymixic ee ay Rotifera, Entomostraca, 
uly 11/Thompson ake m e ; 
y P 3 palatal eave ne “Fd [rere WIM eioreGel|_ Gancde 915 Protozoa,and Protophyta. 
ances ireatapaonte tare gata j 4] 1 | 675 fr.t25 1 667 | .180 | .400| 2.222 | 133,559 | 438108 | 3.280 Entomostraca somewhat more abundant than in 
a alnaclienre rewelllerea ee iso | aancan lee 1.844 the preceding test. Plankton polymixic, 
; I ae yp og .110 ae ee 183,595 aes Much silt and debris. Polymixic plankton. En- 
Aug.28| Illinois River | 30m. | 4 | av. | .200 1.178 | .090 1.223 | 44,339 | ......- PSE Wiles g al 4 del og 
Sule -280 | .839 | - page eel) leteay |) Geoecun 3.600 
5 I 275 | .250 .g09 | .085 | .085 1.000 | 160,932 1.929 
oll ease |e SCH ere 1.000 | .075 | .... 1.133 | 157,749 1.968 
3gom. | 5 5 170 1.471 | -095 .789 | 148,519 2.090 
5| 7 | -260 .962 | .110 .682 | 153,193 2.02 
| J 5 | av. | .239 1.047 | .oo1 -934 | 155,203 2.000 | Very little debris. Polymixic plankton. Rofifera, 
Oct. 14|Thompson’s Lake|-— — = = —| especially Syacheta, Protozoa, Entomostraca, 
Gal 2 400 .312] .150 | 945 -283 | 146,418 2.120 | Protophyta, and diatoms. Largely small forms, 
5| 4 110 1,136 | .055 | ..-- -773 | 213,388 1.455 
15m.| 5] 6 | .200 -625 | .100 -425 | 187,924 1.720 
Pt . 180 -694 | .075 .567 | 166,917 1.860 
5 | av. | .163 .767 | .077 -552 | 179,630 1.738 
£ 20 cm, below | 30m. } 5] 1 {1.375 |3.200 2.327 | .800 2.100 2.625 |2,071,384 |7,755,061 3.740 
8 surface 15m.| 5} 2 |1.800 | 2apa .889 | .700 | 2400 1.500 1,830,862 | 2755963 2.118 5 , 
4 ——— Monotonic plankton. Principally Syacheta, a 
€| gocm.below | 30m.| 5] 3 |r.o5o]....| ...... azote pa | ee boifeeeE | -onowa || -asosce few, Synura, nauplil, -Brachionus, and Comonelta. 
S surface 13m.| 5] 4 QOO) eaperarel | fieveietersieye AOOM | Miteret1 letter stere MeyAipleetione |t- aceon 
1897 
| nee cal e258 rarer -804 ] .105 | .... 1.468 | 593,311 
5m.| 5] 3 | .350 .976 | .100 1.542 364,135 
natal 5 EN | . 388 ° -881 103 1.503 | 478,723 
hte || aldo 1.242 | .13 2.28 ; 4 
Iom.}| 5| 6 | .680 1.00) ee ae ane 
| 5 av. 615 yooon itoitit Sh66%) |e 2.327 | 403,605 
5| 8 | .630 1.627 | .180 is 75 “2 7 f 
15m |G) $00 1,281 | .165 ai eo atte 
5 | av. | .715 1.434 | .173 2.681 | 310,236 i ixi 
Taig aeeapaeee 1S: aren : a | ake pa li al P| sat A Sep Ee debris. 7 e 
1.36 AG) ; ankton. Leffodora, Cyclops, nauplii, Difiugia, 
2om.| 5 ae a za aes and Fiagellata. 2 e 
(eae ee ee 1.656 | .225 2.740 | 274,019 
| 5 2.373 | .195 3.952 | 223,065. 
cba H 3.107 | .135 25 hon 
| pe 2.690 | .165 cooy 4.672 | 194,545 
5 2.828 | .230 | .925 4.022 | 22, eat 
5 1.952 | .260 | .... : yee 
gom.| 5 A 38 235 Se ioeH08 
5 2.158 | .276 aegeh)| eYee ee 
2.847 | .250 3.700 1e92b0 
2.332 | .250 3.700 | 203,712 
