1054 
10. The reproducibility of these cells is not less good than that 
of the y-cells. Calculating from (3) the E.M.F. of an a-cell at 0° C. 
the value (E,)°° = 0.05245 Volt is found, while a cell which had 
formerly been measured at 0° C. (see our third paper on the allotropy 
of cadmium) gave the value 0,05225 Volt. This cell had been prepared 
at a different time using different materiais. 
11. In order to calculate the heat of transformation of e-cadmium 
into y-cadmium at 18°.0 C. we have to introduce the numerical 
values into our equation (1). 
From (2) we find: 
(E.)'" = 0,05217 Volt. 
EE), — — 0,0002437 SL, 
1 0 Pr degree 
From (3) we get: 
(£)18° = 0,04885 Volt. 
dE. \18° Volt 
= — 0,000200 — 
al J. degree 
(E,)18° — (£,)18° = [0,05217 — 0,04885 — 291 (—0,0002437 + 
7 x 
+ 0,000200)] 46105 = 739 gram calories. 
If one gram atom of e-cadmium is transformed into y-cadmium, 
the change is accompanied at 18°.0 C. by an absorption of 739 
gram calories. 
12. It may be pointed out that the temperature at which (£,),—(/), 
represents the metastable transition point of the reaction ¢-cadmium 
= y-cadmium. 
If we put (2) = (3), we find: 
0.00305 == 0.0000437 (¢ — 25) 
j= 348 
Utrecht, January 1915. van ’T Horr- Laboratory. 
