A404 The Ielectric Capacity of Atoms. 
for the dyads. In the last row of the table are given the 
values of 10K, B2/v, to be discussed immediately. 
Li. Na. Ke Rb. .Cs.~ Migs, Care” as Ba. 
RNa eee o00, 444. 653 6i:3) (G78) 4s 53 54 d7°3 
Bee stoke oe 2 74 186 344 56 56 86 106 166 
BPE Peete Rest 627 324 162 1:28 ° 1:08 +658 S16 4720s 
10K,B/)... 89 8870) BI 78 re ee 
Zn. Cd. Ag. Pb. i: Cl. Br. Te 
PNGTE caus verene 475 52°5 DOT o7 46-1. 65-9 675 = 667 
Bh Oe ak 10°6 12°5 6:8 38 a8 rey tS) 26 36 
KG Wenner ees 5°36 4°60 2°66 4°59 2-02 159 1405-127 
10K Be/puener 82 70° 72 8B 9 
In the case of the halogens it is interesting to compare the 
values of the dielectric capacity thus derived with the values 
of N,’, thus 3 | 
125 Ci: Br. il 
Ie ae, ee ae 1:34 2-48 9-72 3°10 
1 eae a eanensiitee 2-92 1:59 1-40 1-27 
A study of those values shows that in the halogen atoms Ky, 
instead of being equal to N,’, varies inversely as Ny’. 
Returning to the main table, we find that K,B*/v is con- 
stant without a single marked exception, although the halogens 
have Just been shown to be so exceptional in regard to 
Maxwell’s law. We have therefore this result, that the 
dielectric capacity of an atom is directly proportional to the 
valency and inversely proportional to the square root of the 
volume of the atom. It is interesting to find that valency, 
which Faraday proved to be of fundamental importance in 
his electrolytic law, is of similar importance in connexion 
with dielectric capacity, that predominating electric property 
of matter which Faraday discovered. As to the physical 
signification of our law for K,, it seems that it may be sought 
by the foliowing short train. of speculation. I have shown 
that cohesion can be traced to the mutual attractions of the 
electric doublets in molecules acting like minute magnets. 
Thus cohesion is an electrical phenomenon. By following 
out a similar train of reasoning it can be shown that rigidity 
in solids is a mechanical result of the electric doublets in the 
molecules. At absolute zero the rigidity is equal to the 
electric energy of these doublets per unit volume. But to 
express this electric energy we must regard it as proportional 
