True specific heat — 
Temperature — 
Fig. 1. 
Considering the figure more closely it is evident that sodium has 
a transition point between O° and 90°: this was not known up to 
the present *). 
11. We have here for the first time a case where it is possible 
to obtain at will, and in nearly quantitative yield, either the stable 
or the metastable solid modification from a metallic melt. Until now 
Ernst COHEN, HRELDERMAN, Morsverp and VAN DEN Boscn have not been 
able to get this result in their investigations on bismuth *), copper’), 
zine *), antimony®) and lead’). In these cases the different modi- 
1) Scräprer [Lieb. Ann. 20, 2 (1836)], thinks it probable that sodium crystallizes 
in the regular system, whilst Lone [Journ. Chem. Soc. 13, 122 (1860)] found 
that it is also able to crystallize in the quadratic system. 
2) Zeitschr. f. physik. Chemie 85, 419 (1913). 
8) Proc. 16, 628 (1913); 17, 60 (1914). 
4) Proc. 16, 565 (1913); 17, 59, 641 (1914). 
5) Proc. 17, 645 (1914). 
6) Proc. 17, 822 (1914), 
