284 Recent Improvements in Science. [April 



3. Acidulous water of Cambon. — M. Blondeau, (Journal 

 de Pharm. xxi. 674.) finds this water, which is situated in 

 the department of Cantal, in a clay slate formation to 

 contain 



Bi-carhonate of soda, 

 Carbonate of magnesia, 

 Carbonate of lime, 

 Sulphate of soda, 

 Chloride of sodium, 

 Carbonic acid, 

 Traces of organic matter. 

 III. Hot Springs. — In the neighbourhood of the volca- 

 noes of the Cordilleras, according to Boussingault, ' the 

 temperature of thermal springs does not diminish with the 

 altitude, from which it would appear, that the heat is 

 derived from internal fires. They contain carbonates of lime 

 and magnesia, chlorides of calcium, and sodium, sulphates 

 of soda, lime, magnesia, traces of silica, carbonic acid, 

 and sulphuretted hydrogen gases, (Ann. de Chim. 52. 181.) 

 IV '. Sulphureous Waters. — Waters of St. Genis. — Professor 

 Lavini procured from a litre (61*02 cubic inches) of this 

 water, 19*5 cubic centimetres, (1*17 cubic inch) of carbonic 

 acid, 5 (0*3 cubic inch) sulphuretted hydrogen, and 17*5 

 (1*05 cubic inch) of azote, and the following solid contents 

 in the same volume of water: 



Silica O0254 grms. 



Peroxide of iron- - 0*0066 

 Alumina - - - - 0*0015 

 Carbonate of lime - 0*0535 

 Iodide of sodium - 0*0136 

 Sulphate of soda - 00151 

 Carbonate of soda - 0*2733 

 Chloride of sodium - 2* 1034 



2-4924 

 St. Genis is situated in Piedmont, about 4 leagues to the 

 East of Turin. The temperature of the water is 5° R. 

 (44°1 F.) (Memoire della JReale Accademia, delle Scienze di 

 Torino, xxxvi. 19.) 



