ti 10 
the transitional state, the other the differences of the second system 
with this transitional state. 
As far as the values of energy are concerned such a solution was 
already proposed by van’? Horr in the Etudes de dynamique chimique 
and recently also Travrz has tried an analogous splitting up of the 
values of energy, as we already mentioned in our previous paper. 
Though in his earlier papers on reaction velocities Travrz considered 
a universally holding resolution possible, against which we thought 
we had to protest in the cited paper, Traurz has introduced as pos- 
sible ways different from reaction to reaction in his later papers, and 
with them different ways of splitting up, so that as far as the 
values of energy are concerned the difference between our considera- 
tions and those of Travrz has partly disappeared. Yet also in this 
respect a difference continues to exist in our views, for Travutz exe- 
cutes the splitting up of the energy at the absolute zero, and it 
seems more plausible to me to attribute the course of the reaction 
to the difference of energy at the reaction temperature. For the 
present it will certainly not be possible to obtain a definite decision 
of this question, as for the greater part the quantities occurring in 
the expressions for the velocity of reaction, have not yet been 
measured with sufficient accuracy, or sometimes are not even liable 
to direct measurement. 
With regard to the splitting up ot the entropy the difference 
between the mentioned views is still greater. Whereas Travutz does 
not execute a splitting up of the entropy and introduces the absolute 
value of the entropy of the reacting system into the equation of 
velocity making use of the integration constants of the vapour 
pressure, an analogous splitting up seems necessary to us also for 
the entropy, especially when we adopt the views which BOLTZMANN 
has expressed on chemical actions in his Gastheory. 
In the cited paper we have illustrated by the example of the 
chlorine-hydrogen equilibrium, how we think we have to imagine 
the transition states occurring there. If we adopt the standpoint of 
BouTzMANN’s theory, we must assume that the two hydrogen atoms 
in the hydrogen molecule are bound, in consequence of the fact that 
the “kritische Räume” of the two hydrogen atoms cover each other 
entirely or partially, and also those of the two chlorine atoms in 
the chlorine molecule. If we now inquire into the reaction between 
a chlorine and a hydrogen molecule, we must imagine that the two 
molecules get so close together that the four “kritische Räume” 
of the four atoms will entirely or partially coincide, so that the 
four atoms are in each others’ sphere of action. After this transitional — 
