266 The Ohio Journal of Science [Vol. XIX, No. 5, 



fumes very acid, of powdery white appearance, with little steam. A 

 single breath of these fumes made one cough and run for pure air. 

 The opening was small, irregular and cracked, but the volume of gases 

 emitted was great. The temperature at the surface was 260 C, 1J^ 

 feet down, 264 C. Photographs 3716, 3717. 



No. 7. T. 166 C. West of No. 6, 200 yards. 



This fumarole was 200 yards N. W. of No. 6, on top of the east bank of 

 the north-south gulch cutting across the mountain east of the crater 

 of Novarupta. The temperature was 166 C. Some very interesting 

 colloidal red and orange deposits were found in the throat. It was a 

 long fissure roofed over most of the way with deposits, but steaming 

 in several places. The best deposits were exposed by the spade about one 

 foot down. 



Photograph by Jasper D. Sayre 



TAKING THE SURFACE TEMPERATURE OF FUMAROLE 10. 

 As in the case of most of the hot ones, the steam did not condense until some 

 distance from the orifice. With the thermocouple in the position shown, 

 the temperature was 240 C. An idea of the appearance of this vent from 

 a distance may be gained from the Smokes in the background. 



No. 8. T. 294 C. Mt. Cerberus, due S. Baked Mountain, N 18 W. 

 XI, S 65 W. 



This was on the Valley floor between Falling Mountain and Broken 

 Mountain, about 500 yards beyond a big steamer under Falling 

 Mountain, in which no temperature above 100 C. could be found 

 -although Sayre went down twenty feet into its throat supported by a 

 rope. No. 8 was a round hole, about two feet in diameter, in hard 

 baked sand on the bank of a gully. The deposits for 25 feet around 

 were white and very hard, with purplish brown incrustations in the 

 throats of the many cracks and crevices from which the hot gases were 

 issuing. Surface temperature 294 C. 



