1022 
With regard to the observations at high temperatures it should be 
borne in mind that the term with rv is positive, because the influence 
of the bromine vibration will be the greatest. Hence the value of 
M‚M 
log — 
Sa 
the above table. But moreover the value for log X has been calcu- 
lated on the assumption that at the test temperatures bromine is not 
dissociated into atoms. From the expression of the bromine dissociation 
of § 12 (equation 14) it would, however, follow, that under the 
circumstances of these experiments the bromine is split up for a 
great part, and that thence a large correction is to be applied for 
log K. This correction, however, makes log K smaller, hence the 
value in the fourth column also becomes smaller, which would 
3 
becomes smaller than the values of the fourth column of 
render the agreement with the first value of log TEN still worse. I 
1 
have not succeeded in bringing these determinations in satisfactory 
concordance with the electromotive ones. If the correction which is 
to be applied in Voce von FALCKENSTEIN's observations for the disso- 
ciation of bromine into atoms, was sufficiently accurately known, 
an attempt would be justified to get agreement between the values 
MA 
aí 
Mr 
1 : 
a smaller value for the heat of reaction; the energy term in 19 
MM, 
at the lowest 
Jf 2 
Cal 
temperature than at the higher temperatures. The consequence of 
MM, 
this would then be that the value of —— 
My 
corresponds to the mean molecule radii. But then the value which can 
be derived from BertTHEeLot’s observations, and which is not smaller, 
but greater than that of THomsrn, would plead against this attempt. 
* by a change in Sn. We should then have to choose 
of log 
then yields a greater decrease of the value of log 
became smaller than 
16. The equilibrium 2 HIZH, + J,. 
The value for the reaction energy having a very great influence 
on the value of the moments of inertia also at this equilibrium, I 
will try to derive this value directly from the observations them- 
selves in an analogous way as in the iodine dissociation. This is 
possible here because the number of observations of the iodine 
hydrogen dissociation equilibrium is much greater than the bromine 
hydrogen equilibrium. 
When in 15 we fill in the values for the masses of the reacting 
