FEALE.] SHOSHONE GEYSER BASIN UNION GEYSER. 257 



Ii^orth cone: Water at 8.25 a. m. is bubbling and spurting, and has a 

 surface temperature of 198° F. Four feet below the surface the tempera- 

 ture is 204, The south cone spouts a few feet above the top of the cone. 



August 21. — During the night the geyser has been in constant agita- 

 tion, with a great deal of noise. 



At 7.46 a. m. eruption began. 



7.51 a. m., water ends in center cone and steam comes out in great 

 volumes with a steady roar. 



7.56J a. m., water period ends in north cone. 



7.58 a. m., the roaring noise ends. 



8.48 a. m., the eruption ends with the exception of a few puffs at long 

 intervals. 



The maximum height reached was 114 feet. During the playing the 

 column was deflected 6° from the perpendicular by a strong wind. The 

 spray produced a beautiful rainbow. 



At 10.10 a. m. no water could be seen in any of the cones, although 

 the sound of boiling far below could be heard. 



Center cone : 10.36| a. m. steam begins to come out in puffs. 



10.37 a. m., first spurts of water, reaching 10 or 15 feet, followed by 

 eruption. 



10.45 a. m., water stops in the center cone and the steam roar begins. 



10.54.0. a. m., lull. 



10.54.45 a. m., perfectly quiet. 



10.55.15 a. m., begins puffing steam. 



11.00.50 a. m., lull. 



11.1.0 a. m., begins again. 



11.5.30 a. m., lull. 



11.5.50 a. m., puffs steam. 



11.11.20 a. m., lull. 



11.11.35 a. m., puffs steam. 



11.12.50 a. m., lull. 



11.13.5 a. m., puffs. 



11.14.20 a. m., lull. 



11. 14.30 a. m., puffs. 



11.15.5 a. m., lull. 



11.15.15 a. m., puffs. 



11.15.52 a. m., lull. 



11.16.3 a. m., puffs. 



11.16.43 a. m., lull. 



These keep up for some time, gradually growing fainter until the 

 eruption of steam is entirely over. 



7.46.30 p. m., there is a pumping sound, as though an eruption were 

 about to take place. This is about the time it ought to occur. 



7.48, the pumping sound ends. 



North cone: 10.38 a. m., water eruption begins. 



10.43 a. m., full jet is projected . 



10.45 a. m., maximum, 66 feetj attained. 



10.48 a. m., water stops. 



10.49 a. m., spurt of water. 

 10.49.45 a. m., end of water eruption. 



August 22. — At 8 a. m. the water is in sight at the bottom of the cen- 

 ter cone and can be seen actively boiling in the north cone. 



Evening: Water has been rising during the day. 



August 23. — At 8 a. m. the water is within two feet of the top in the 

 center cone. The surface temperature is 199° F., 5 feet below the sur- 

 face it is 206° F. Water is flowing from the vent between the center 

 and south cones. 

 17 H, PT II 



