615 



TABLE XIV.— Concluded. 

 Relative Number of Planktonts in Illinois River and Spoon River. 



Date 



rotatoria entomostraca insect larvh miscellaneous total species total planktonts 



1896 

 18 VIII 

 25 VIII 

 16 IX 



30 

 14 

 29 

 17 



IX 

 X 

 X 



XI 



3 XII 

 28 XII 

 Average 



1897 

 3 II 



II 



III 



V 



V 



VI 



26 

 •'2 

 27 

 25 

 28 



10 VIII 

 26 VIII 



11 IX 

 2 XI 



30 XI 

 28 XII 

 Average 



1898 

 25 I 



22 II 

 29 III 

 V 

 VI 

 VII 



W 



7 

 5 



5 VIII 

 12 IX 



4 X 



2 XI 



6 XII 

 Average 



1899 

 3 I 



7 II 

 7 III 



361, 6S0 

 185, 720 



45, 59; 



48.642 

 131, 600 



172. S00 

 86, 700 

 100, 340 



2,720 

 768 



3, 600, 

 960 



3,560 

 480! 



2, 880 

 841 

 24i 



68,160 

 31,480 



63, 070 

 16, 400 

 9, 120 



4,920 

 9, 340 



26, 140 



60i 

 36 



3, 36i 

 561 

 480 



2. 56Q 

 4f 



160 

 80 



320 



80 



13( 



40 



240 

 1.4SS 



240 



280 

 80 



240 

 80 

 80 

 30 



4,120 

 1,520 

 2,607 

 2, 400 

 4,640 



5,360 



1,665 



520 



i;sn 

 216 

 240 



, 480 



240 

 40 



. 880 



114 

 100 

 85 

 85 

 68 



120 



10, 973, 920 



1, 388, 120 



600, 005 



977, 434 



2,173,440 



5, 408, 460 



1, 252, 579 



362. 720 



34,460 

 34, 704 

 14, 520 



20, 080 

 20, 920 

 30, 680 

 17, 880 

 9. 820 

 1, 360 



141, 634 



10, 460 



26, 200 



47, 180 



1, 276, 000 



2, 287, 160 



351, 900 



658, 120 



2, 059, 360 



1,744,250 



8,900 



109. S4U 



9, 040 



1,561 



50 



2,88i 



20,001 



34, 8001 



217,400 



27, 900 



15, 300 



1,330,200 



2, 362, 4001 



1,072,800 



1, 965, 600, 



1, 135, 20 



28, 539 



3,520 



2,100 



21, 320 



67, 000 



84, 720 



22, 700 



116,100 



86, 240 



618,750 



19, 500 



55,340 



5, 720 



89! 



85 



10. 



60 

 481 

 60 

 20d 

 600 

 900 

 700 

 600| 

 IIUII 

 900 

 600 

 800 



30S 



40 



440 



320 



100 

 160 



600 

 2. 100 



too 



40U 



400 



4. 000 



100 



715, 701 



126, 603 



48,649 



115, 880 



2, 663. 400 

 903, 000 

 153, 000 



1, 294, 240 



197, 960 



105, 020 



156,300 



64,280 



682, 08k 



91, 918 



. ooo 



800 

 ,920 



,4m i 

 .in in 

 .4011 

 , 200 

 .4011 

 ,sso 

 ,600 



3, 987 



600 



85 



703 



:■:. n;i 



2, 800 



14, 700 

 1,200 



100 



400 

 400 

 760 

 80 



ion 



120 



40 



400, 

 2, 10U 

 3, 700 



:.'.ooi 



1,400 



160 



2. 854 



1,040 



H, 400 



2,080 



4, 000 



10,240 



40,900 



24,400 



15, 760 



26,000 



1,900 



7, 000 



1,760 



655 



5. 



10.2U0 



2S,tsOO 



2,500 



200 



2. 400 



77 



44 

 45 

 81 

 67 

 90 

 71 

 102 

 80 

 62 

 65 

 46 



3,892,085 



529. S4S 



41,300 

 112, 310 



108, 860 



14, 587 



6, 720 



sou 



73,498 



2,840 

 13, 976 

 18, 500 



2, iiso 



41 



GUI 



16? 



000 



11, 757 



7,661 



3,285 



1,940 



13, 200 



23, 600 



5,040 



3,360 



2,420 



2,700 



4, 360 



680 



.3, 000 

 200 

 720 

 960 



200 



1,500 



200 



6, 204 



2,640 



861 



2,140 



?> 



12,000 



74 

 35 

 100 

 78 

 67 

 96 

 81 

 89 

 79 

 75 

 40 



25 



293 



450,' 



1,498, 



358, 278, 



91,362, 



14, 968, 



3, 667, 



3, 782, 



4, 832, 



239, 



520, 



160, 



20, 492 



1,720 

 52, 800 

 423, 200 

 591. 600 

 460, 600 

 136. 700 

 93, 400 

 418, 000 

 467,600 

 061,000 

 113, 900 

 258, 800 



40, 004, 47S 



592, 831 



708, 501 



645,840 



402, 352, 600 



34, 323, 200 



4, 562, 360 



2, 386, 920 



1, 603, 300 



1,287,720 



1, 275, 380 



2, 043, 090 



1, 923, 1 



85, 600 



41,800 



70, 400 



1, 895, 360 



165, 900 



209, 100 



261,200 



48, 700 



65, 000 



53, 300 



24. 800 



41,071,06? 



309, 2S0 



318,022 



1,121,980 



265, 560 



16, 840 

 10, 800 

 52, 000 



Averag 

 Grand Ay.. 

 Ratio.. 



87, 490 



465, 067 



1.9 



2,507 

 238,828 



11, 772 

 63,983 



213 

 2,255 



104 

 .17 



201 

 616 



6,805 

 2.8 



2.430 



5*3, 094 



, 283, 295 



38 



26, 547 

 750,429 



