1051 
He found it to be 532 gram calories per gram atom of tin at 0° C. 
3. For several reasons the calorimetric method used by Brénstep 
cannot be applied to our case. We therefore carried out our expe- 
riments with a Transition Cell of the sixth kind, which has been 
deseribed by Ernst COHEN. *) 
This cell is constructed according to the scheme: 
Electrode of a metal M Solution of a salt of M | Electrode of the metal 
in its stable modi- of an arbitrary M in its metastable 
fication. concentration. | modification. 
4. Hitherto it was impossible to make a quantitative application 
of this cell, as no metal, having a transition point, was known 
which exists in an electrically sharply defined condition. 
Our measurements will prove that the transformation a-cadmium 
= y-cadmium is especially suitable for such an investigation. 
As we have in view the carrying out of some other measurements 
with our a- and y-cadmium, we have not brought them together in 
one single transition cell, but used them as the negative electrodes 
in cells which were constructed according to the scheme given by 
Hurerr. These cells were studied separately. Consequently our cells 
were made up as follows: 
Unsaturated solution | 
Cd-a of CdSO, of an Cadmium amalgam... .(a-cell). 
arbitrary concentration | 8 percent by weight 
and 
Unsaturated solution 
Cd-y of CdSO, of an | Cadmium amalgam .. . (y-cell). 
arbitrary concentration 8 percent by weight. 
5. On applying the equation of Gipps—von HELMHOLTz: 
« 
pw pee 
RT 
to the a- and y-cell separately, we find: 
den ne | 
(En). = oe tl; Ant eee 
ne dT 
and : 
4 (£. )y 7 dh, 
EN =—— nend 7 aig at na a COLL) 
dT 7 
1) Zeitschr. f. physik. Chemie 30, 623 (1899) 
