ORIGIN AND USE OF NATURAL GAS AT MANITOU. 



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The temperature of the Navajo and Manitoii springs was 

 tested on two or three occasions and found to be about 15" C 

 In July, 1894, it was also the same. On December 81, 1894, 

 after five days of quite cold weather (the thermometer reijis- 

 tering nightly — 18" C. or lower), and again on January 10, 

 1895, after a continuous period of cold weather, the tempera- 

 ture of several of the springs was tested, and samples of water 

 from some of them also taken. The temperatures observed, 

 and the residues obtained by evaporation of the samples of 

 water, are given in the subjoined table. The residues are 

 given in grains per gallon. 



* A small precipitate of au iron compound had formed and settled before the 

 analysis was begun— the result is therefore a little low. 



fTlio Hiawatha spring is covered with an iron cap, cemented to the curbing, 

 and the water tested on December 31 was obtained from the overflow and caught in 

 a gallon measure, and as the vessel was cold tlie temperature obtained \ as probably 

 too low. On January 10 the thermometer was held in the water escaping from the 

 overflow pipe. This overflow pipe is buried under four or live feet of gravel and is 

 some twenty or thirty feet in length. 



The gas emitted from all of these springs is pure carbon- 

 dioxide. The quantity given oft' from the different springs 

 is quite unlike, varying from a few hundred cubic centi- 

 metres per hour to three or four hundred litres or more in 

 the Navajo and Cheyenne. The flow from each spring is, 

 generally, during the greater part of the year, very uniform 

 in quantity, though it is said that after heavy rains or when 

 snow is melting the quantity given off is increased. This 

 increase may arise from greater hydrostatic pressure of the 

 swollen stream upon small vents in the creek bed and unseen 

 vents along the banks near the springs, thus forcing more gas 



