404 



an equimolecular compound with a point of solidification lying at 



— 94-4°, is actually present; but — , and this particularly gives 

 evidence how necessary the study of the melting point figure is to 

 obtain full certainty about the appearance of compounds, — we see 

 at the same time, that besides the mentioned two other compounds 

 appear, viz. of the concenlrjiiion 2 (C^HJ, . CHCl, and (C.HJ, 

 O.2CHCI3; the latter of these has a point of solidification at 



— 93,3°, and the former does not present a stable melting-point, 

 but before this temperature has been reached, viz. at — 113,8°, it 

 is subjected to the following conversion: 



2(C,H.\ O.CHCI3 ^ (C^HJ, O.CHCl, + L. 

 It is now interesting to consider in connection with this the 

 /9,.?;- figures of the same system, as they have been found first by 

 KoHNSTAMM and VAN Dalfsen, and then by Dolezalek at 33°,25 ; 

 60°, and 100°. (fig. 3). 



muH-LCHCi, 



y\%. 3. 



It is now very probable that the peculiar shape of these p,r- 

 figures, especially that for the low^est temperature, is influenced not 

 only by physical forces, but hy the side of them also by chemical 

 forces. 



General and Anorganic- Chemical Laboratory 

 of the University. 

 Amsterdam, June 26, 1918. 



