8 
1,78 _ 200,6 
— 992412 °° 13,6 
(FULDBERG calculated the critical density = 3,77. From this would 
therefore follow : : 
by = 117 x 10-5 
200,6 si: 
ee B U 
3,77 < 22412 
li}, = '/, vries assumed (to y = 1,corresponds r = 2). We finds 
119 X 10. The value calculated from mercury itself, viz. about 
120 > 105, .is therefore apparently lower than the value calculated 
from the compounds, viz. 150 X 105 — a phenomenon that can be 
explained by the different molecular states at 7}, and at lower 
temperature. 
8) Calculation of War from the values of Tp and by of the 
halogen compounds. 
From 7; = 78,08 az: br (See § 2) follows immediately : 
Ly Noe 
78,03 7 
a == Opt se ot) Ma Da en NIN 
from which we can calculate «7, as soon as besides 7 the value 
of by (e.g. according to the method of «)) is known. For the mer- 
cury halogen compounds we now have successively : 
For HgCl, : 
976 
78,03 © 
hence Va, for He =S ae ot ML a 
For HgBr, : 
ak = 
x 384 Xx 10-5 = 480 Xx 10-4; War = 21,9 X 102, 
== ca < 484 10-9 = 627 5010-45 Yap Zoe 
; 78,03 © 
from which Hg = 25,0 — 2: >¢ 6,9 SSA « OZ 
Hor Hel, : 
De sao to 
78,03 ZS ZA / ) c ed) 
hence He == 28,3—2 X §,8.— 10:7 De 10-2. 
For Va, for mercury in compounds we are therefore justified in 
assuming as mean value: 
Var = 11,0 s< 10-2. 
The found value agrees perfectly with the expected value in the 
5!) principal series. In the 4'' principal series an average of 9 was 
namely found for lodine and Xenon — so that in view of the 
value 7 in the 3'¢ series — 11 could now be expected. 
