SUEVEY OF COLORADO AND NEW MEXICO. 119 



quietly from a syenite on the left bank, aiid flows iu a slender stream 

 into the Fontaine. A few bubbles of gas are rising- continually to the 

 surface, but the excess of carbonic acicl is not proportionately so great 

 as in the other springs. There is a comparatively small deposit of car- 

 bonate of lime in the bed of the little canal which the water has worn 

 away through the rock, and none in the vicinity which could be traced 

 to the overflow of the spring. The water shows no trace of volatile 

 substances which would escape during the evaporation, except carbonic 

 acid. Its reaction is feeblj^ alkaline. 

 The salts held in solution are as follows: 



Much— N^aO . OO2 



KO . CO2 



CaO . CO2 



NaCl 



AI2O3 

 Trace — Fe . 



The Iron Spring. — This showed the presence of that metal from which 

 it is named by a very insignificant deposit of the familiar brown oxide 

 in its vicinity. No volatile substances in the water. Reaction alkaline. 

 The salts in solution were : 



*K0.C02 

 NaO . CO2 

 *Li0.2C02 

 (Probably as carbonate) — FeO . CO2 



NaCl 

 AI2O3 



The amount of iron in solution in the Iron Spring was unusually 

 small ; the amount of alumina being greater and that of lime less than 

 in "The Doctor." 



The Beast Spring. — This is next to the largest. A continuous line of 

 bubbles of carbonic acid is perpetually ascending from the bottom. The 

 taste of the water is not so pleasant nor pungent as that of the other 

 springs. 



The analysis showed — 



^2,0 . CO2 



KO . CO2 

 I^Ia.Cl 

 S 

 AI2O3 



The Bathing Spring was not analyzed, but its salts cannot be very dif- 

 ferent from those of the "Beast." A noticeable feature of this latter is 

 the small per cent, of sulphur which probably is present in soda or 

 potash alum. The ebullition of gas in the "Bathing Spring" is enor- 

 mous and keeps the water in a constant state of agitation. 



This spring bursts out from a syenitic rock, but by the overflow of its 

 waters it has covered the latter with a crust of carbonate of lime sev- 

 eral feet in thickness and much broader than is the case at the celebrated 

 High Eock Spring of Saratoga. It is as if a white tablecloth were laid 

 over the rock. I have never seen so violent an escape of gas except 

 from the Salina near Kissingen, in Bavaria. 



* The potasli and litWa reactions -witli the blowpipe are sufBciently distinguishable 

 to enable one possessing the requisite experience to recognize them with a little trouble ; 

 but in the field, where time is short and opportunities meager, it is not always easy to 

 do this. I venture to give them both without stating Avhich predominates, reserving 

 the solution of this question for the first opi)ortunity which offers iu the future. 



