221 
1918-19.] An Electron-Transference Hypothesis, etc. 
The simple cases in which multiple bindings do not occur are 
Cl 
Cl 
H 
H 
t 
t 
f 
1 
(1) Cl<-c->ci 
(2) H->C->C1 
(3) H-»C-» 
Cl (4) H->C«-H 
* 
f 
t 
Cl 
Cl 
H 
H 
giving values for C denoted by C +4 , 
c +2 , c_ 2 , c. 
_ 4 respectively, where C 
denotes the atomic refractivity of carbon. 
The values for chlorine and hydrogen deduced by Brtihl in the paper 
already cited are for the D-line of the spectrum 6‘01 and 1*05 respectively, 
and the values for compounds given above are 
CC1 4 = 26-59 giving 
C +4 = 2*59 
CHC1 8 = 21*89 
C +2 = 2-84 
CH 8 C1= 1300 
C_. 2 = 3-85 
CH 4 = 6-62 
C_ 4 = 2*42 
These values show that with the exception of CH 4 the values of 
C increase as its electro-negative nature becomes more pronounced, and 
also taking n = 12 the result ( b ) is true — with the exception noted — so far 
as order of magnitude is concerned, for 
C — C 
- ~ 2 ^ x 100 = 33 per cent, by observation and 42 per cent, by formula. 
C_ 2 
c _ c 
x 100 = 26 per cent, by observation and 28 per cent, by formula. 
C— 2 
The value for oxygen when in the form l{0 has been very accurately 
determined to be 2'29. 
From S^q, S +4 is obtainable, 
and from S_ 2 can be obtained. 
Molecular refractivity of H 2 S = 9*28, 
„ „ „ S0 2 = 10-23, 
and from these we deduce 
S_ 2 = 7T8 and S +4 = 5*65, 
showing (a) 
s_ 2 >s +4 , 
and ( b ) 
g g 153 
A — 190 = - — =21 per cent, from experimental values, 
o_ 2 7*18 
and 
= = 17 per cent, by formula, 
taking 
n — 32 = atomic weight of sulphur. 
This apparent agreement, however, in the case of sulphur must be 
accepted with caution, as the experimental values obtainable are few. 
