1903 - 4 .] The Viscosity of Aqueous Solutions of Chlorides, etc. 239 
Effect of Concentration . — The effect of concentration on the 
viscosity depends very much on the temperature, as is seen in fig 4. 
The viscosity of hydrochloric acid increases with increase of con- 
centration at all three temperatures ; this is in accord with 
Wagner’s results ( loc . cit.). 
Increase of concentration increases the viscosity of hydrobromic 
acid at 25° and 15°, hut decreases it at 0° C. In the case of the 
salts the viscosity decreases at 0° with increase of concentration, 
at 15° bromide and iodide still decrease, while chloride passes 
through a minimum ; and at 25° chloride increases, while bromide 
and iodide pass through a minimum. This is in agreement with 
Sprung’s * conclusions, qualitatively at least, as will be seen by com- 
* Loc. cit. 
