EMO»... 
ate from the old sea as the result of evaporation. But I 
am rather of the opinion of Anıkın that the salts are mainly 
due to the constantly continued chemical weathering. 
Chlorides and sulphates occur most frequently both in the 
soil of the desert and in the salt-lakes. These two groups of 
salts are often found separate, so that some lakes have 
mainly sodium chloride in solution, while others have mainly 
compounds of sodium and magnesium sulphates. The latter 
are called bitter-lakes. Anıkın explains the difference in the 
following way. The wind assorts the material which has been 
crystallized out through evaporation. The common salt 
crystallizes out first and as a firm mass, then the sulphates 
crystallize later above this in loose powdery masses which 
later, when left dry, are carried off by wind, the firmer 
masses of sodium chloride being left as a coherent deposit. 
In a supplement to MippENDORFF’s memoir on Ferghana, 
SCHMIDT gives a number of salt-analyses from which the 
following are selected: 
1. Kara-Tjubé, salt-desert. Crystalline Powder with glauber- 
salt, gypsum, bitter-salt and clay: — 
Salts soluble in water: 74,2045 per ct. 
including: Na,SO, 62,4234 per ct. 
CaSo, 8,5121 — 
MgsO, 3,1500 u 
1.0, 6,9351 — 
2. Mojan. Efflorescence upon limestone: — 
Salts soluble in water: 21,661 per ct. 
including: NaCl. 2,742 per ct. 
Na,SO, 11,287 — 
CaSO, 6,977 = 
CaCO, 47,447 — 
