Dr. Du Riche Pretter — Mineral Sjjrings of Baden. 153 



(95° F.), and yields about 720,000 litres (160,000 gallons) in 

 24 hours, which quantity is, however, easily capable of being trebled. 



The Schinznach spring bears analogy more especially to the 

 springs of Loueche (1,415 m. or 4,641ft. above sea-level), which 

 contain, in 1,000 parts, 1-48 sulphate of calcium and 0-23 sulphate 

 of magnesium, but have a higher temperature, viz. 45° C. (113° F.), 

 while their considerably larger aggregate yield amounts to 6,000,000 

 litres (1,312,000 gallons) in 24 hours. 



4. Wildegg, 356 metres (1,168 It.) above sea-level. This is a saline 

 spring, rising at the bottom of an artesian well at a depth of 256 m. 

 (about 840 ft.) below the level of the river Aare. In addition to 

 chloride of sodium, it contains, as characteristic constituents, iodine 

 and bromine. The temperature of the spring is 15° C. (59° F.), and 

 its present yield is only about 75,000 litres (17,000 gallons) per annum. 



Appendix. 

 In the following Table the writer has determined by calculation 

 the probable depths below the surface of upwards of 30 well-known 

 or otherwise remarkable thermal springs, with the great majority of 

 which he is acquainted, and whose temperatures, according to official 

 statistics or otherwise authentic records, range from 20° to 90° C, or 

 68° to 194° F. The formula used is that already given for deter- 

 mining the depth of the Baden springs — ■ 



(Temperature of spring — 10° C.) X 30 = depth in metres. 

 If no allowance be made for the initial temperature of the atmospheric 

 water percolating through the rocks down to the collecting-basin — 

 in other terms, if the temperature at the surface be taken at 0°C. 

 (32° F.), the depths given in the Table have to be increased by 

 300 metres, or 1,000 ft. 



Depth of Thermal Springs 



