706 DESCRIPTIVE GEOLOGY. 



The mean result of two analyses of the soluble portion is as follows: 



Soda 39.87 



Potassa 2.87 



Lime '..'. 1.17 



Silica - 0.10 



Sulphuric acid 53.23 



Chlorine 2.32. 



99.56 

 Oxygen equiv. to chlorine 0.524 



99.036 



The theoretical composition of the constituents would give: 



Sulphate of soda 86^664 



Sulphate of potassa — * 5.307 



Sulphate of lime 2.770 



Chloride of sodium 3.824 



Silica 0.100 



Sulphuric acid in excess 0.371 



99.036 



The solution of the soluble portion was feebly alkaline, and, in addition 

 to the substances determined, indicated the presence of a trace of magnesia. 

 With the spectroscope, it gave a strong reaction for lithia, and with turmeric 

 paper one for boracic acid. 



The lower view given on Plate XXI represents the opening of one of 

 these springs around which no tufa cone has been formed, the surface of the 

 water lying in nearly the same level as the ground, which is here partially 

 in crusted with alkaline salts. The walls of the spring are funnel-shaped, 

 and the pool so clear that the observer can look downward for 30 or 40 feet 

 to the naiTow orifice below, through which the water reaches the surface. 



At the point of the diorite spur, but probably in close connection with 

 the rhyolites, is a second group of hot springs, with a temperature of about 



