148 
(/’’} satisfus the well known thermo-dynamie relation 
dlgK _ Q 
dt nr 
Hemptinne and Brkaert') have observed a velocity constant for 
the reaction (C,H,),N + C,H,B, — (C,H,), NB,. 
Here they found a dependence on the temperature which can 
be represented by a formula as (///"), but not by one as (//7’). 
The same holds for a reaction investigated by von HaLBAN’). KRÜGER *) 
proceeds in a calculation as we did in the first part of this paper; 
he thus finds temperature functions as in (/'), (//'), (///'). His model 
is therefore too limited. The purpose of this paper is to show how 
this may easily be avoided by inventing a somewhat wider model. 
Krüerer however thought the idea absolutely to be rejected, that 
for a combination a certain minimal velocity should be required *). 
Of course 1 do not pretend that in any case a formula as (/1") 
or (///") will hold. To be able to calculate a right formula, we 
must of course know the mechanism and as, even for the most 
simple dissociation, for that of hydrogen this is not the case, we 
shall have to content ourselves with an image. 
When van DER Waats derives his equation of state considering 
the molecules as perfectly elastic particles, he uses an image certainly 
not corresponding with reality. But still Boar is of opinion that Bd, 
may be compared approximately with the radius of a ring. Just as 
well as nobody will deny the quantitative insight given us by the 
considerations of vaN DER Waats, notwithstanding the special image, 
I think that the above formulae when they shall have been suffi- 
ciently tested by the experiment, will also give to some extent a 
quantitative insight into this phenomenon. 
The above considerations have of course no relation to the 
theory of quanta. The specific heat corresponds to that with 6 degrees 
of liberty. 
Physical Laboratory, Delft. 
1) Hemprinne und Bekaert, Zeitschr. f. physik. Chem. 28, 236 (1898) 
2) Hans von HALBAN ib. LXXVII 6. p. 731—733. 
8) F. Kriiger, Göttinger Nachrichten, 1908, pag 318 seq. 
4) See further: K. F. HerzreLp, “Zur Theorie der Reaktionsgeschwindigkeiten” 
Ann. der Phys. 59, p. 635, 
