293 
have been found by Ramsay and Gray, Z. f. ph. Ch. 70, p. 121) 
this yields the equation: 
0,869 
f— 1,738 | 1 -— Se fh 
| 1,869 : 
For #, we have namely m= 211,1 : 377,6 = 0,559. We therefore 
calculate 6; — 291 X 10 5, whereas 6,=277 «10-5 is directly 
found from 7% and p,°). 
At the triple point m, = 2021 : 377,6 = 0,535, through which 
< 0,550 | = 1,738 (1 — 0,260) = 1,286. 
fF, becomes = 1,738 (1 — 0,249) = 1,305, and further: 
Pie fy 2305" 215,87 =: 2.44. 
If we summarize the values found and used in what precedes 
in the Hydrogen-Helium group, we get the following survey. (See 
Table A p. 292). 
The value N placed on tbe lefthand of the sign for the element 
denotes the value of the “core charge”, in connection with the 
frequencies of the so-called high frequency spectra of the elements 
(Moserey). MN is also sometimes called the atom number of the 
elements concerned. We shall later on make a few more remarks 
on the ratio A (atomic weight): V. 
The coefficients of direction y refer.to the values of D and LD’ 
determined experimentally; the quantities y’ have been calculated 
from formula (2). 
We subjoin the values 7, 7, 7, ete. used, and also the above 
determined products 7, < «,, which are a measure for the ratio 
(v,—b,):v, at the triple point. 
1) From b¢k= RTK: 8pk we, namely, calculate with pr= 62,43 atm. bk= 
= 976,8 K 10-5. And from ar = RT X bk X (27: 8A) we find further (> =0,98) bz = 
= 131.8X10—-4, hence Vaz = 11,5 X 10-2. In the Sth series of the periodic 
system a value for bz is expected somewhat greater than 275 & 10-—5, which 
would be valid for Supra-iodine (277 X 10—5 satisfies this demand), and for Vaxa 
value =+11>X10~-2, as was found among others for Hg (see | and II). Also 
this last expectation is again very nearly fulfilled. 
We point out here, that when for Neon not the critical temperature estimated 
last by K. ONNes, viz. + 45° abs., but the somewhat higher value found before by: 
K.O. and CROMMELIN (1911), viz. some degrees below 55° abs. — or the value 
found by RANKINE also in 1911, viz. 61°,1 abs., or the value found by RAMSAY 
and TRAVERS in 1900, viz. < 68,1, is taken, we find somewhat higher values for ax and 
bk than the before given values bs = 7110-5, War=2,0 K 10—2. If we assume 
Ti. = 60° abs., pk = 29 atm., then with a = 0,998 bx becomes = 94,7 X 10-5, ak = 
= 7,035 X 10-4, Vaz = 2,65 X 10-2. This latter value for Wap fits in already a 
good deal better with the system drawn up by us than the too low value 2,0, where 
a value 3 or slightly smaller than 3 was expected. With Tx = 65° abs. we should 
have found db; = 102,6X 10 5, Vaz =2,9>X10—2, which would be still more 
satisfactory. 
