282 Notice of some Recent [April 



possesses traces of iodine. Five wells hold in solution the 

 following substances : — 



Chloride of sodium - - 

 Chloride of calcium - - 

 Chloride of magnesium 

 Sulphate of soda - - - - 

 Sulphate of lime - - - 

 Carbonate of soda - - - 

 Carbonate of lime - - - 

 Carbonate of magnesia 

 Iodine 



The valley of Magdalena possesses some iodine waters, 

 and that of Cauca a great number. 



On the plain of Mira is situated the base of the volcano 

 of Cotocaxo. This plain is covered with sand and common 

 salt, which is most probably derived from the subjacent 

 trachyte, a rock containing glassy felspar imbedded in a 

 basis of pyroxene. 



2. Water of Songragne. — The temperature of this water 

 is 74° C. (45J F.) The spring is situated 706 metres (770§ 

 yards) above the Mediterranean, and arises from a sandstone 

 covered by secondary limestone. The salts present with 

 their water of crystallization are, according to Berther, # 

 Sulphate of soda . . . 12*22 



35-55 



Memoirs, 313. 



