PEALE.] 



HEART LAKE GEYSER BASIN RUSTIC GROUP. 



299 



The following observations on the eruptions are copied from Mr. Gan- 



nett's notes. 



Boiling. 



Emptied. 



Stopped. 



Height. 



Pulsations. 



h. m. s. 



10 46 00 a. m. 



11 02 00 a. m. 

 11 18 30 a. m. 



h. m. s. 



10 50 00 a. m. 



11 05 30 a. in. 

 11 21 00 a. m. 



h. TO. is. 



10 51 00 a. m. 



11 06 36 a. m. 

 11 22 00 a. m. 



Feet. 

 45 

 35 

 40 





47 

 45 



The eruption, therefore, begins with a preliminary agitation, lasting 

 from 2^ minutes to 4 minutes, and the duration of each eruption noted 

 was 1 minute, and the interval between the beginnings of eruption was 

 just 15 minutes in each case ; so. judging from the few notes presented, 

 this geyser i& very regular in its periods of action. 



Columbia Spring (Plate XLI a). — This is a very handsome, large basin, 

 measuring 48 by 53 feet. It has a broad, white border, which projects 

 in plate-like masses over the water of the spring. There are two large 

 outlets bordered by the same character of deposit, and in the channels 

 are rosette-like pieces resting on slender, stem-like pedestals. 



Prometheus Spring is 6 by 8 inches, but is an active, boiling hole on 

 the side of the hill. There are several small, boiling holes back of the 

 Eustic. The following are the sizes of some of the springs : I^o. 4 is a 

 pool; :So. 1, 20 by 20 inches; No. 2, 4 by 6 feet; No. 3, 7 by 14 feet; 

 No. 5, 5 by 6 feet; No. 6, 3 by 6 feet; No. 7, 1 by 5 feet; No. 8, 7 by 8 

 feet. 



RECAPITULATION. 



The following is a recapitulation of the springs of the Heart Lake 

 Basin : 



Group. 



Number of 

 springs. 



Highest surface 

 temperature. 





25 

 53 

 20 

 40 



n 



°'F. 

 198 





198 





175 





198 



Iluatic Group ^ 









Total number of springs noted 



149 









The following is the list of known geysers. 

 them are meager: 



The details in regard to 



Name. 



Interval. 



Maximum 

 height. 



Spike Geyser 



Deluge Geyser 



Pulling Spring or Geyser (?) 

 Eustic Geyser 



Not IcnoTrn 

 Not known 

 Not known 

 15 minutes. 



Not known. 

 15 feet. 

 Not known. 

 45 feet. 



