(576 ). 
ET INE Mt ie Bel jae A, “4 So 6 Witt 
Fig. 4. 
We may therefore summarise the above conclusions as follows. 
Ist. An accurate theoretical investigation of the capillary-elec- 
trometer shows, that the surface-tension as a function of the charge 
of the double-layer is not to be expressed by the simple equation 
Y = Go — ko, but by the relation 
Y= Py — Aw — (k + B) of? 
2nd. The coefficients A and ( differ as to whether the charge of 
the solution is negative (A negative) or positive. For a !/;)-normal 
solution of KCl &+ 6 is in the first case twice as great as in 
the second, and A is in the former case negative, in the latter positive. 
3rd, The electro-capillary-curve consists of two parts of different 
parabolae, which meet each other at A = 0, and of which the course 
of the ascending branch is much deeper than that of the descending 
branch. 
4th, The ascending branch presents a maximum „and this maximum 
need not coincide with the point, where A=0. In our example this 
difference amounts to 40 millivolts, 
