244 Wisconsin Academy of Sciences, Arts, and Letters. 
Table II. Observations on Dissolved Gases. 
The depth is given in meters, the temperature in degrees centigrade, and the gases 
in cubic centimeters per liter of water. The last column shows the per cent of satura¬ 
tion of the oxygen. In the free carbon dioxide a minus sign indicates that the water 
was alkaline, a plus sign that it was acid, and neut. that it was neutral to phenolph- 
thalein. The degree of acidity or alkalinity is indicated by the number of cubic 
centimeters of carbon dioxide that would have to be removed or added to make the 
water neutral. 
Lake Amatitlan, February 5, 1910. 
Depth, 
meters 
Temperature, 
degrees C. 
Carbon dioxide 
Oxygen 
Free 
Fixed 
Cc. per liter 
Per cent, of 
saturation 
0 
20.2 
—3.34 
32.28 
5.88 
89.8 
5 
5.93 
90.5 
10 
20.1 
5.70 
86.9 
15 
19.8 
-3.84 
32.28 
4.75 
72.0 
20 
19.6 
neut. 
32.28 
4.35 
65.7 
25 
neut. 
32.28 
4.38 
66.2 
30 
+1.67 
32.28 
3.63 
54.8 
34 
19.6 
+2.78 
32.28 
3.34 
50.4 
Lake Atitlan, February 12, 1910. 
0 
19.6 
-2.23 
37.84 
4.55 
68.7 
5 
19.4 
4.43 
66.7 
10 
19.3 
-2.23 
37.84 
4.46 
67.0 
20 
19.25 
4.49 
67.4 
30 
4.50 
67.5 
50 
19.2 
—2.23 
37.84 
4.40 
66.0 
75 
-2.23 
37.84 
4.40 
66.0 
100 
-1.67 
37.84 
4.40 
66.0 
150 
4.37 
65.7 
200 
-1.11 
37.84 
4.39 
66.0 
250 
—1.11 
37.84 
4.15 
62.2 
285 
—1.11 
37.84 
4.07 
61.0 
315 
19.2 
—1.11 
37.84 
4.03 
60.4 
Lake Ilopango, February 23, 1910. 
0 
26.2 
+2.78 
47.30 
4.98 
84.0 
5 
26.2 
4.98 
84.0 
10 
26.0 
4.80 
80.8 
12.5 
25.6 
4.30 
71.9 
15 
25.5 
3.82 
63.7 
20 
25.4 
3.50 
58.3 
25 
25.4 
+2.78 
48.41 
3.34 
55.6 
50 
25.4 
+4.46 
48.41 
3.30 
55.0 
75 
+5.00 
48.41 
3.15 
52.5 
100 
+5.56 
3.14 
52.3 
150 
+6.67 
48.41 
3.08 
51.3 
180 
+6.67 
49.00 
2.98 
49.7 
215 
25.4 
+7.23 
49.53 
3.05 
50.8 
) 
