1911.] 



The Properties of Colloidal Systems. 



237 



In fig. 1 a curve is given correlating conductivity in recip. ohms x 10 6 as 

 abscissae with osmotic pressure in mm. Hg as ordinates and in fig. 2 a curve 

 with concentration in millimols. per litre as abscissae and osmotic pressure in 

 mm. Hg as ordinates. 



It will be noticed that the curve of fig. 1 is slightly convex to the axis of 

 abscissae, whereas that of fig. 2 is practically a straight line, although some of 

 the points marked are somewhat divergent, as would not be unexpected in 

 measurements of so much difficulty as direct determinations of osmotic 



