703 
When v is zero, we find: 
E(k) 
p‚® = p= 
a a 
’ 
in this case p‚® and p, are almost equal, and the registered curve 
must consist of two almost identical curves. 
As was stated before (p. 696), the velocity with which the boun- 
Aristallisatiesnelhetd tri re. Mper pir. 
Temp eratuur van het grensvlak der „asen 
e = 2 
10 15 20° 25° 30° 
Fig. 4. 
dary of the phases moves, will depend on the temperature, prevail- 
ing at that boundary plane. The aim of my investigation was, 
besides testing the theory of the problem of the conductivity of 
heat which we meet with in cases of solidification, the determination 
of the functional relation between velocity of crystallisation and 
boundary temperature. This relation is completely determined by 
the nature of the substance (salol), and does not depend on the 
peculiarities of the method of observation *. 
1) In fig. 4 the observations made with different tubes, are indicated by different 
symbols. 
