IOWA ACADEMY OF SCIENCE 
147 
TABLE III. 
TEMPERATURE OP WATER 98°C.. IN EACH CASE. 
Sample No. 2 
Sample No. 3 
First 
Runni’g 
Second 
Runni’g 
Third 
Ruiini’g 
First 
Runni’g 
Second 
Runni’g 
Third 
Runni’g 
Weight of piece 
9.0395 
7.9221 
7.2923 
10.1065 
9.1416 
8.2156 
Insoluble 
.2690 
.2817 
.1530 
.2628 
.3430 
.3016 
Al .,03 and Pe .,03 
.0373 
.0493 
.0941 
.0483 
.0695 
.2138 
Ca CO 3 
.7946 
.2934 
.0500 
.6479 
.5110 
.0125 
Mg C O 3 , 
.0165 
.0054 
.0064 
.0049 
.0025 
.0212 
Per cent dissolved 
12.36 
7.95 
4.13 
9.54 
10.13 
6.68 
Total per cent dissolved... 
12.36 
19.33 
22.68 
9.54 
18.70 
24.13 
Time run 
120 hrs. 
120 hrs. 
120 hrs. 
120 hrs. 
120 hrs. 
120 hrs. 
Total time 
120 hrs. 
240 hrs. 
360 hrs. 
120 hrs. 
240 hrs. 
360 hrs. 
TABLE IV. 
TEMPERATURE OF WATER, 98° C., IN EACH CASE. 
Weight of piece 
Insoluble 
AI 0 O 3 and FeoOa 
Ca CO3 
Mg C O 3 
Per cent dissolved 
Total per cent dissolved... 
Time run 
Total time 
Sample No. 4 
Sample No. 5 
First 
Second 
Third 
First 
Second 
Third 
j Runni’g 
Runni’g 
Runni’g 
Runni’g 
Runni ’g Runni ’g 
10.3076 
8.4970 
7.9158 
10.4800 
8.6093 
.6104 
.2000 
.2510 
.6004 
.1845 
.0328 
.0315 
.0405 
.0292 
.0366 
1.1121 
.3446 
.4610 
1.1809 
.2777 
.0553 
• .0051 
.0059 
.0656 
.0023 
17.56 
6.84 
9.58 
17.90 
4.78 
17.56 
23.20 
30.56 
|17.90 
22.68 
96 hrs. 
96 hrs. 
96 hrs. 
96 hrs. 
96 hrs. 
192 hrs. 
288 hrs. 
96 hrs. 
192 hrs. 
The power of the water at 17‘’C. was appreciably greater than at 
98®C. The reason for this, as assigned by Dr. W. R. Whitney, Presi- 
dent of the American Chemical Society, is that the water at 17°C con- 
tained a larger amount of C 0 \ dissolved out of the air. We stated, 
two years ago, that all the results entered into mineralogical literature 
showed a definite power for C 0" waters and other acid waters of the 
soil to act upon all minerals containing calcium, to remove the calcium 
in solution. Observe the following: 
(Clarke, Data of Geochemistry, Bulletin 330, U. S. Geological Sur- 
vey, p. 165.) ^‘Meteoric waters carrying free carbonic acid are probably 
the most powerful of agents in the solution of rocks, although their 
