645 
=4 
“8 16 14 i2 {0 ê 6 
Fig. 1. 
the difference between CO, and CO amounts to about 2 calories, 
and the algebraic sum of the specific heats amounts, therefore, only 
to some calories. A value of 47 must certainly be considered as 
impossible. We find something similar for the other equilibrium. At 
490° the heat of transformation is zero (104 7'—! = 13.106). From 
the observations at 765° and 400° we ealculate for the heat of 
transformation resp. — 5176 and -+ 6563 cal. The heat of trans- 
formation, therefore, changes over 365° by 11739 calories, which 
corresponds to a sum of specific heat of 32.2 calories. Theoretically 
we again expect a value of some calories. Hence there is no agreement 
here either. | 
If we now examine which determinations are the most reliable 
it is easy to see that it is certainly the observations at the 
highest temperatures. At lower temperatures the said equilibria are 
metastable with regard to carbon. The equilibrium 2COZCO,+C 
; ep. CO ee = 
yields a value for ——, which is not constant at a definite tempe- 
CCO, ER ri 
