GEOLOGICAIi SURVEY OF THE TEREITORIES. 



119 



of great aesthetic beauty. The immediate orifice is nearly circular, and 

 beautifully scalloped arouud the margins, extends straight down, and 

 the Yfater rises within an inch or two of the scalloped margin. The 

 water is in a constant state of agitation, boiling up 2 feet at times. 

 The margin has a coating of bright cream-yellow, while all around the 

 surface there is the most delicate and intricate embroidering, surpassing 

 the most elaborate ^. 



Fig. 51. 



ic.^ ~^. 





lace-work. Surround- 

 ing the crater is an 

 outer reservoir 4 feet ^^ ^ 

 wide, with a white and :!^^^^^ 

 reddish-yellow rim, --'^"^'^ 

 while in the bottom of 

 the reservoir is the 

 variegated sediment 

 which aids in giving 

 such a wonderfully 

 gay appearance to the 

 spring. A stream ofm^^ 

 water flows from the^ 

 spring to the river, 

 and the channel is punch bowl, no. i. 



lined for fifty yards with the variegated sediment. Near this is another 

 mound which rises, with laminated steps, about 6 feet. I called it the 

 Bath-Tub. (Fig. 50.) It has much the shape and size of our ordinary 

 bathing-tubs, 5 by 10 feet, beautifully scalloped around the inner margins 

 with the spongiform or cauliflower masses of silica inside, and the outer 



;;^ - ^^ _g.f_::f-„^ ■'■'•'iV^ .. -^ 



Fig 



surface adorned with 



the greatest profusion 



of the pearly beads; 



the water is constantly 



boiling up 2 feet high, 



though but a small 



quantity flows from it. 



There are numerous 



_ craters or chimneys 



-^ which are well worthy 



t" of attention, similar to 



^ those just described, 



J as the Punch Bowl and 



-^"^^^^ Dental Cup. (Figs. 51 



and 52.) 

 On the 



summit of 



DENTAL CUP. 



the great mound, is 

 one of a class I have 

 called central springs ; 

 it is located on the highest point of the mound, on which this great 

 group belongs ; has a crater 20 feet in diameter, very nearly quiescent, 

 slightly bubbliug, or boils near the center, with a thin elegant rim 

 projecting over the spring, with the water rising within a few inches of 

 the top. The continual but very moderate overflow of this spring uni- 

 formly on every side, builds up slowly a broad-based mound, layer by 

 layer, one-eighth to one-sixteenth of an inch thick; looking down into 

 these springs, you seem to be gazing into fathomless depths, while 

 the bright blue of the waters is unequaled even by the sea. There 



