(253) 
In this case the following equation would hold for points which 
are at an infinite distance from the agens: 
u Ae-ar +- Bea 
7 
y= 
M representing the whole mass. 
According to the third condition rw will nowhere become infinite. 
Now rw= WM (Ae—” + Ber) and ey become infinite, if r= oo. 
Only for B=0 this objection has no weight. We shall therefore 
confine ourselves to the function of VAN DER WAALS and a general 
reversion of theorem I cannot be proved in this way. Such a theorem, 
however, would not be of much importance here, as for Bg 0 the 
potential function has properties, which are never found when 
examining molecular forces. 
Potential energy in the unity of volume. 
Let us seek the potential energy of an agens spread continuously 
over several spaces for the potential function of vAN DER WAALS, 
which we write: 
Er 
en) =—f 
r 
If w is the potential and g the density, we get for this quantity: 
1 
wa gfves on Se Bert ether dae OE KEN 
We consider this as being taken over the infinite space. Now we 
get according to equation (11) 
Vwy=Py+i4nfe 
and so 
aN a ard 7 
CF A 7 f 
By substitution in (13): 
1 Û q 
w= — : 2 wdr — —— Pde Sha re ive €14 
ra Ak, 8 Saf a i a4) 
