Av. of all collections 
Natok | Av. of 
Station Year collections eae Plankton} Silt | Total 
1804 10 2.53 2.49 -28 | 2.77 
oe ge toe 1 Co) -gI 3.22 -72 | 3-94 
Illinois River........ 1808 36 ae 1.16 | 2.55 | 3.71 
1897 34 3.28 3-69 | 1.91 | 5.60 
1898 52 2.03 2213" | 2-00 | 4 sea 
1899 13 -42 41 -94 | 1.35 
Grandiavaes st iecee are ae 2.71* 2.19f | 1.79 | 3.98 
Loraleccesears: 235 
itis 9 pee -007 | .349 | .36 
: af 1897 13 F 1.257 |1.173 | 2.43 
spoon River. ...- .2.. 1898 Il ae .029 -796 83 
1899 3 -O1! -O1L |2.2:6 | 2.23 
Grand ay.cn.s.> |Saee one ses 256 465 -939 | 1.41 
Wotaltcnocc css 36 
ak ‘7 1894 14 -gO 1.08 Boaz 2225 
1808 13 -65 -78 .70 | 1.48 
: I 31 2.19 2.59 .20 | 2.79 
Quiver Lake......,.. 1897 34 mite "8 "62 1.50 
1898 26 1.96 2.44 .40 | 2.85 
1899 7 -66 .67 -43 | 1.11 
Grand avicsSs..5|/cose<s-s-e~ 1.75 1.70 52: [e222 
Motalcssao.e 6 115 
1895 12 3.30 3.25 | 2.15 | 5.40 
Dogfish Lake........ 1896 30 3.99 5.01 25G (5 o51 
1897 6 2.65 Fae 22'| 2.45 
Grand av..2 of 2 olen. -se< cee. 3.16 4.22 -88 | 5.10 
Motallss. wscce cc 48 
ee 4 ae eee) 3-45 23-90 
I 27 31 13.05 la, [ee s2 
Flag ake soo tere as 1897 7 5.34 4.50 69 5.28 
1898 6 5.31 2.83 | 4.30 | 7-13 
Grandia: 2 e.s|iees cise. das 9-23 | 11.46 | 1.90 |13.36 
gfe ae eres - ae | 
1894 5 | 8.89 8.89 | 2.23 [11.12 
rae 14 13-31 9.67 1.44 |II.11 
’ I 27 6.67 9.00 22 | 9.22 
Thompson's Lake.... 1897 18 10.41 10.43 | 1.28 |11.71 
1898 25 5.06 5.71 -79 | 6.50 
1899 7 I.15 1.21 2a Less 
Grandiavi. 2 26.2oh en oc see 8.26 7.94 .86 | 8.79 
iGtaltnee en es 96 
1894 I 24.17 24.17 |trace |24.17 
1896 29 14.74 13.17 -77 |13-94 
phelps) Wake)... sec 1897 9 9.15 10.00 -54 |10.53 
1898 22 37-34 | 36.31 | 7.76 |44.08 
1899 6 3-74 3-74 -29 | 4.03 
Grandiavt = ocscle-eaccto nes +s 22.35 19.6 2.95 |22.60 
Matalin cies 67 | 4 : 
*Grand average of all monthly averages, not of annual averages. 
{Grand average of all collections, not of annual averages. 
