GEOLOGICAL SURVEY OF THE TERRITORIES. 



119 





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



beautifully scalloped around the margins, extends straight down, and 



the water 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 p. 



lace- work. Surround- i&-5i- 



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 tothei 



spring. A stream offe,fe 



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 



Fig. 52 



DENTAL CUP 



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 



^^^S^^'^^^S ^f ^^t^i^tic)n, similar to 



-- (^^^-^^^^^S^'' those pist described, 



'"''^^^^ii'-}^^^ as the Punch Bowl and 



■^^^^J^^"' Dental Cup. (Figs. 51 



't:'^^::^><^^^5<^ and 52.) 



On the summit of 

 the great mound, is 

 one of a class I have 

 called central springs ; 



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

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

 slightly bubbling, or boils near the center, with a thin elegant riai 

 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 vsprings, you seem to be gazing into fathomless depths, while 

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



