578 Wisconsin Academy of Sciences, Arts, and Letters. 
The following general facts may be stated: 
Eight of the specimens represent lakes or waters from the 
northeastern part of the state. All are soft water lakes. 
These are as follows: Alleqnash, Bass, Bog Hole, Minocqua, 
Pond No. 1, Swamp Hole, Trout, and Turtle lakes. Lake Su¬ 
perior is in the same general class. Its water v/as taken from 
Bayfield harbor and is less clear than water from the open lake. 
All the other lakes are in southeastern Wisconsin and belong 
to several districts and systems. All but Devil’s lake have 
hard water containing much calcium and magnesium carbonate. 
Madison lakes: Mendota, Monona, Waubesa. Devil’s lake is 
a soft water lake, supplied from the Baraboo quartzite hills, 
about 40 miles north of Madison. 
Oconomowoc-Waukesha group: North, Okauchee, Oconomo- 
woc. Lac La Belle, all connected by the Oconomowoc Kiver; 
Nagawicka and Nemahbin lakes are on the Bark river but not 
connected; Pewaukee lake is in the Fox river basin; Mouse, Pine, 
Silver lakes have no outlets. 
Waupaca group: Beasley, Marl, Otter, Pound. 
Delavan and Geneva lakes are near each other and near the 
southern line of the state. Green lake (about 110 miles north 
of Geneva) is by far the deepest lake in the state and Geneva 
is next to it. These two lakes would in general be said to have 
greenish water. Of the rest. Marl and Pound lakes have the 
peculiar tint of marly lakes. The others have wat^^r whose 
color, as seen from the shore, is determined partly by dissolved 
stains, partly by plankton, and is in general yellow-brown. 
The dates given in the table with the various lakes represent 
the time when the sample of water was collected. 
TABLE 5 
COEFEICIENT OF ABSORPTION IN VARIOUS LAKE WATERS 
Wave Length 
Distilled 
Water 
Allequash, 
X, 1914 
Bass, 
X, 1914 
Beasley, 
X, 1914 
Beasley, 
VIII, 28, 1915 
Bog Hole near 
Trout Lake, 1914 
Delavan, 
VII, 20, 1915 
Devils, 
VII, 17, 1915 
Geneva, 
VII, 30, 1915 
Green, 
X, 11, 1915 
1 Lae la Belle, 
VI, 26, 1915 
I Marl, 
1 IX. 10, 1914 
1 
4700 
.034 
.208 
.984 
..320 
1.430 
.306 
.118 
.324 
.129 
.415 
.239 
4940 
.030 
.883 
.267 
.824 
.229 
.957 
.256 
.102 
.266 
.120 
.302 
.206 
5220 
.030 
.676 
.190 
.748 
.208 
.691 
.239 
.0998 
.194 
.108 
.190 
.195 
5890 
.022 
.545 
.206 
.704 
.203 
.587 
.227 
.0716 
.173 
.104 
.170 
.185 
5580 
.036 
.479 
.210 
.667 
.202 
.526 
.211 
.079 
.153 
.123 
.178 
.197 
5790 
.056 
.460 
.250 
.662 
.256 
.498 
.233 
.166 
.189 
.148 
.224 
.227 
5895 
.096 
.502 
.284 
.680 
.317 
.512 
.262 
.226 
.246 
.190 
.243 
!251 
6005 
.165 
.525 
.318 
.725 
.334 
.541 
.296 
.275 
.278 
.225 
.307 
.294 
6180 
.206 
..515 
.338 
.735 
.348 
.590 
.331 
.305 
.337 
.285 
.358 
.331 
6360 
.225 
.546 
.369 
.745 
.300 
.613 
.352 
.316 
.387 
.369 
.398 
.335 
6480 
.236 
.546 
.390 
.782 
.389 
.623 
.383 
.328 
.404 
.411 
.427 
.345 
6630 
.245 
.581 
.475 
.841 
.398 
.651 
.406 
.384 
.443 
.432 
.470 
.363 
