﻿of Carbon Oxysulphide and Carbon Bisulphide, 299 



the theory upon which the estimates are based. But we 

 must be content with the conservative remark that the 

 dimensions of the carbon oxysulphide molecule, as found by 

 the application of the kinetic theory, are consistent within 

 the limits of experimental accuracy with the view that the 

 three atoms of the molecule, by sharing external electrons, 

 assume the electron configurations and behaviour in collision 

 of particular groupings of the neighbouring inert atoms. 



12. Calculation for the CS.> Model. — Although there exist 

 at present no data for carbon bisulphide which suffice to 

 calculate the mean collision area of the molecule in the 

 gaseous state, the success of the previous comparison 

 would appear to justify a prediction of its value by con- 

 sideration of the appropriate model. This has been repro- 

 duced in the full lines of fig. 3, a. Here again the model is 



one which does not lend itself to exact solution without 

 laborious calculation ; but again, also, we can obtain 

 satisfactorily close upper and lower limits. The area 

 of projection will clearly be less than that corresponding to 

 the model in which the dotted sphere is substituted for the 

 small central one, so that we have three equal spheres of 

 the argon size in line : it will, on the other hand, be greater 

 than if the central sphere is entirely dispensed with, so that 

 there are two equal argon spheres only, as represented in 

 fig. 3, b. The dimensions of the spheres and the distances 



