1015 
1. Srern’s derivations rest on the above mentioned assumptions 
concerning the mechanism of solid substance. Srrrn’s expressions 
and those of § 2 agree in a high degree, but that in his expressions 
the constant part has been accurately represented holds only for 
the definite conception which Stern forms for the solid substance '). 
A rigorous proof for the coincidence of the two scales is in my 
opinion not furnished by this derivation. 
2. The testing of the mercury line seems to plead for the coin- 
cidence of the two scales. In a recent paper in these Proceedings 
Prof. Lorentz carries out a similar test*). In connection with the 
above I think i can state the result as follows: If coincidence of 
the above mentioned scales is assumed, the dimension of the “elementary 
regions” appears to be about 4%, but as the coincidence of the scales 
is not proved, little weight is to be attached to the conclusion con- 
cerning the extent of the “elementary regions”. This is probably a 
too rigorous statement of the conclusion of the mentioned paper; 
for the other difficulties which attend this testing, I must refer to 
the cited paper. Let us now consider that the entropies of § 2 (of 
my preceding paper) rest on the assumption that the area of the 
regions is really 4’; then at least if the expressions are correct and 
may therefore be applied to the evaporation, the coincidence of the 
two scales would become probable for this case. 
3. From the caloric data on iodine SrerN has calculated the 
difference of entropy between solid iodine (/,) at 7’= 0 and gaseous 
iodine (in atomic state) at 7 — 323%). Stern now uses for the 
entropy of the gaseous atomic iodine the expression which was 
derived by him for monatomic gases, and in which (see $ 8) the 
entropy of solid atomic iodine at 7’=0O is taken as zero. It is 
clear that in this way the algebraic sum of the entropies of the 
solid substances at 7’—=O can be calculated. 
If, however, the values of § 2 are introduced for the entropy of 
atomic gaseous iodine, we do not find in this way the algebraic 
sum of the entropies of the solid substances, but only the entropy 
of solid iodine (/,) at 7=—0O. If, therefore, the entropies of § 2 
are assumed as the correct ones, it follows from this calculation 
that the entropy of solid iodine (/,) at Z’=O does not become 
zero, but — 7.6. Thus interpreted, this would plead against the 
coinciding of the two entropy scales for iodine. 
10. With this interpretation I think I can also get agreement with 
1) Stern, |. c. 
2) Verslagen Kon. Ak. Amsterdam, 28. 515. (1914/15), (still to be translated). 
5) Stern, Ann. der Physik. (4) 44 513 et seq. (1914). 
