PEALE.] HAYDEN'S valley springs MUD VOLCANOES. 105 



The three principal springs of this locality having been described, I 

 now present the special points in reference to the others that are enu- 

 merated in the table : 



]> o. 1. — This mud spring has a funnel-shaped crater, at the bottom of 

 which the mud rises in two hemispherical masses, which every now and 

 then burst, sending up a spurt of mud. The contents do not appear as 

 thick as in 1872, due probably to the rainy season sui)plying a greater 

 quantity ot water. Near the principal crater is a second of the same 

 shape, with quiet muddy water at the bottom. 



Nos. 2 and 3 are in the basin of the mud geyser, which was so filled 

 with water that theoutlines of these springs could not be distinguished, 

 and the temperatures were therefore not taken. 



No. 4 is a turbid mud spring, with a scum on the surface. It gives off 

 sulphureted hydrogen. 



No. 5 is a mud pot, which appears to be almost dried up, although 

 boiling and throbbing can be heard somewhere below. 



No. 6. — In this spring the green color is probably due to the color of 

 the basin or bowl of the spring. 



No. 8. — Besides the springs enumerated in the table, there are other 

 simmering holes, and opposite them across the trail is a steam sulphur 

 vent. 



No. 9.— Above this on the edge are numerous small springs. 



No. 11 <i, &, and c. — Above these the ground on the edge of the small 

 rivulet is perforated with sulphur-lined steam vents and sizzling holes. 



Nos. 13 and 14, — These springs occupy one basin. No. 13 being an 

 irregular pool of green sulphur- water, outside of which are a number of 

 sizzling holes and several small springs, from 1 foot to 2 feet in diameter. 

 Under No. 14 two of these are given. They are constantly boiling, and 

 are really sources of supply to the pool (No. 13). The small water-ways 

 leading to the latter are lined with a vividly green deposit. 



No. 15. — The contents of this mud pot is a light-colored mud that looks 

 like paint. At one end there are hemispherical bulges. Back of the 

 mud crater there are sulphur-lined vents on the side of the hill. There 

 are also other mud craters near by. 



No. 16. — There is a very large sulphur pool, with vents and springs on 

 the hill back of it. Nos. 17 and 18 are two of these holes near the large 

 pool. No. 19 is a small mud volcano near it. North of it is a blue mud 

 pot or volcano, with a circular mound around it. At the bottom is a 

 blue mud, so thick that the steam which escapes from a great many 

 points throws it into concentric rings. Hemispherical bulges also occur 

 and burst, splashing the mud in all directions. Steam is constantly es- 

 caping, and the hole looks like some great pot of blue or lead-colored 

 paint. 



No. 20. — This is a mud pot with lavender-colored contents. It is at the 

 head of a ravine leading down to Nos. 21 and 22, and has a basin G by 7 feet, 

 in which are 7 or 8 points of bulging hemispherical masses 6 inches in 

 diameter; are raised 3 or 4 inches, and leave the mud in rings that look 

 like melted taffy. This spring was not seen in 1872 or 1873, as it is some 

 distance back of the othei s. 



No. 21 is a large, constantly boiling mud pot, with greasy-looking con- 

 tents. 



No. 22 is a turbid sulphur spring or pool, with yellowish water, which 

 has many points of ebullition. The temperature appears to have de- 

 clined since 1871. 



No. 23. — This number designates the springs in a ravine near the 

 river's edge, just south of the springs included in the group from No. 13 



