( 66 ) 



definite boiling points of liquids which have reached their tinal 

 equilibrium, which occurs after some hoiu-s at the ordinary temperature. 



At the same time we get, in place of the vapour curve 2, the new 

 ■» apour cur\'e 6. As the velocity of reaction above 40'' Itecomes very- 

 great, the lines 1 and 2 cannot be accurately determined above this 

 temperature. For 1 this causes no inconvenience as its further course 

 must be almost vertical, but the upper part of 2 becomes rather 

 uncertain. 



The final boiling-point curves 5 and 6 are situated much closer 

 together than the first named one and have moreover an exceedingly 

 irregular shape. It cannot as yet be decided whether this is solely 

 attributable to the formation of vSCl^ molecules in the mixtures, or 

 whether other compound molecules are formed. 



The formation of compound molecules may be noticed not only 

 from the change of colour, but also from a diniinution of' the \olume 

 and will if possible, be studied quantitatively. 



The important question in what manner the melting-point curve 

 of solid SCl^ is modified by the [)resence of more or less compound 

 molecules in the liijuid phase is still the subject of investigation. 



Chemistry. — ''The cdoclty of fraiisfonnafioa of carbon inonoMcle 11". 

 By Dr. A. Smits and L. K. Woli-f. (Communicated by Prof. 

 H. W. Bakhuis Roozeboom). 



(Communicated in the meeting of May 30, 1903). 



In our previous paper on the abox'e subject ^) we communicated 

 results obtained at the temperatures 256°, 310" and 340'', from which 

 we concluded that at these temperatures the transformation of CO 

 into COj and C is unimolecular. 



Our present paper contains the results obtained at 445°. This 

 communication appears to us to be of importance for the following 

 reasons. Three months after our first paper a communication appeared 

 from ScHENCK and Zimmermann*) from which it appeared that they 

 had also studied the transformation of CO into CO., and C and had 

 arrived at the result that the reaction at temperatures from 310° 

 and 360' was a unimolecular one, thus confirming our experiments, 

 but that at 445° the reaction became bimolecular. 



On continuing our investigation we found, however, that the 



1) Proc. 8 Jan. 1003. 



2) Ber. 36. p. 1231. 



