Geological Chemistry of Yellowstone National Park. 351 
Art. XXXV.—Contributions to the Geological Chemistry of 
Yellowstone National Park. 
Geyser Waters and Deposits. 
THE following include all the specimens analyzed which are 
hot distinctly siliceous. 
1. Mammoth Hot Springs, Old 9th Terrace Spring. 
Grams to Imp. gallon. 
Sodium sulphate <:2.0-2. 022 34°44 
Sodium chloride - 18°90 
Calcium carbonate.__._-..-.-- 17°92 
"Magnesium carbonate 8°68 
RIGGS oe ea ae ot aes 3°36 
83°30 
2. Deposit from Mammoth Hot Springs.—This was in white 
Masses evidently incrustations. The structure was distinctly 
radiated. It was soluble in hydrochloric acid with efferves- 
cence, leaving only a trace of residue. 
Calcium carbonate Meus 98°80 
Magnesium carbonate 1°36 
Alumina and iron oxide --.---- 0°45 
ea ee 0°25 
Waiter . ue. a res ra 0°50 
99°36 
3. Cleopatra Spring. 
Sodium sulphate- ...--------- 
1e CRIGOC cca nce cic wd 13°496 
Calcium sulphate... -------- 13°587 
Calcium carbonate ....-.----- 24°850 
Magnesium carbonate .--. - --- 7455 
ilica weer a 3°500 
