GEOLOGICAL SURVEY OF THE TERRITOEIES. 139 



5,52 p. Bi. — Temperature of water is 148° F. and the air 48° F. The 

 water is four feet lower than it was during the eruption, and the sides 

 of the basin are shown sloping inward. Several steam-vents, not seen 

 before, are now made apparent. The surface of the water is quite jjlacid, 

 save in the center, where a slight bubbling takes place. The water seems 

 to be rising slowly. 



6.37 p. m. — The water has risen one foot since the last observation 

 and is still rising. 



7.37 p. m. — The water is now six inches above the level last observed. 



9.35 p. m. — The eruption commences. 



9.48 p. m. — The eruption ends. The maximum height was estimated 

 at 20 feet, it being too dark to take any angles. 



August 12. 



6.19 a. m. — The geyser has evidently had an eruption during the night. 

 The basin is full and the center in ebullition. 



6.31 a. m. — The eruption commences. 



6. 35 a. m. — There is a lull. 



6.42 a. m. — The eruption ends. The maximum height was 25 feet, and 

 I noticed that the ground shook beneath me while the eruption was go- 

 ing on. 



10.19 a. m. — The temperature of the water at the edge of the basin 

 is 148° F. and the air is 60° F. The center is bubbling, and a black, 

 oily substance floats on the surface. 



10.29 a. m.— The temperature of the water is from 140° F. to 180° F., 

 and it is rapidly filling the basin. 



10.49 a. m. — The eruption commences. 



10.55 a. m. — There is a lull. 



10.58 a. ni. — The maximum (18 feet) is attained. 



11.02 a. m. — The eruption ends. 



11.08 a. m. — The temperature at the edge of the basin is 170° F. ; air, 

 60° F. The water has fallen a foot already. 



11,15 a. m. — Water, 150° F.j air, 60° F. The water has fallen eighteen 

 inches. 



11.20 a. m. — The water has fallen five inches since the last measure- 

 ment. 



11.24 a. m. to 11.29 a, m. — The water still has a temperature of 150° 

 F., and has fallen 2 feet 10 inches. 



11.39 a. m. — The water has fallen 3 feet 2 inches since the eruption 

 ceased, (lowest point.) 



11.49 a. m. — The water is rising slowly. 



2.39 p. m. — The water is within one fo@t of the top of the basin and 

 bubbling in the center. Its temiDcrature near the edge is 146° F., the 

 air still being 60° F. 



3.14 p. m. — Te-mperature outside the rim of the basin is 125° F. 



3.15 p. m. — The eruption commences. 

 3.21 p. m. — There is„a lull. 



3.25 p. m. — The maximum (22 feet) is reached. 



3.27 p. m. — The eruption ends. Temperature of water at edge of 

 basin 170° F. 



7.39 p. m.— The eruption commences. 



7.44 p. m.— There is a lull. 



7.48 p. m. — The maximum (19 feet) is reached. 



7.51 p. m. — The eruption ends. 



