306 
The value of 4; found for oxygen has been immediately calculated 
from 7, and pr (see I); the other values (placed between brackets) 
are those which have been found for the compounds. We have 
further still: 
TABLE G. 
aan eae EENS rk sce: 
rah | 7 Te ollitibe D, k ape Ei, ei 102V-ak | 10’V a, | Diss. 
| | | lie Tr "| calculated = incomp.\degr. x 
EEN EN ET Ce RETE NSS Ten == 7 EET 
Os 54,1 | 90,10/ 154,25) 49,71 0,4299 1,71 2,82 3,85 2,6 2d 
Se -302,0 717,6 073 || — a 1,36 2,48 4,28 6,3 (Si) | 6,3 0 
| | | 5,1 (Se) | | 
Se, | 493,3 961 |(1310)|| — - (1,36) 2,63 497 | 143 | 7,1 0,32 
Tey | 725,6 1663 |(2260)|| — — (1,36) © 3,11 7,10 || 25,5 | 9 0,79 
The value 2,6.10—2 for O, has been directly calculated from 
Tr, and px (see 1). 
As for the values of fu,, they ascend from about 4 to 7. 
But in this it is noteworthy that the derivation of the relation fu, = 
constant from the hypothetical assumption that at the triple point 
(v,—b,):v, should be constant, is only valid for the case that 
the molecular state at the triple point and the critical point is the 
same. This now is certainly not the case for Sulphur, Selenium and 
Tellurium. In the following paragraph we shall treat this point (for 
Phosphorus) more at length. 
“For the first time we meet with an element (Tellurium) in this 
group which at the critical temperature has already been greatly 
dissociated to atoms, and which accordingly begins to exhibit a 
metallic character. In the following groups of the periodic system, 
which we shall discuss now, this phenomenon stands out more and 
more clearly. ; 
III. The Nitrogen group. 
a. Nitrogen. The value of y is known here from the researches 
of Marnras, K. ONNes and CROMMEIIN, who found for this 0,793). 
‚From this we can calculate the density D, at the triple point (63°,06 - 
abs. according to Kersom and K. Onnes; CROMMELIN found 78° abs. 
for the boiling point). As for 64°,73 abs. D = 0,8622, D’ = 0,0009 
(M., K.O., Cr), we get with =0,3!10 (the same authors) and 
') We calculate from our approximate formula ; = 0,713, therefore just as 
for O, smaller than the experimentally found value. 
