418 Prof. Masson on the Boiling-points, Molecular 



To revert to Table I., it may be pointed out that the varia- 

 y 

 tion in value of -~p is fairly constant as we pass from the 



halide of one alkyl radical to that of its next homologue. 

 This is exemplified in Table III., where the experimental 

 figures for the chlorides and iodides of the first four normal 

 fatty radicals are compared with consecutive multiples of the 

 figure '041. 



Table III. 





^ T found. 







Radical. 





n. 



«X-041. 



Iodide. 



Chloride. 



CH 3 



•2023 



•2037 



5 



•205 



2 H 5 



•2489 



•2500 



6 



•246 



C 3 H 7 ...... 



•2844 



•2870 



7 



•287 



C 4 H 9 



•3182 



•3251 



8 



•328 



In this table it is intended merely to call attention to the 

 comparative regularity of the increase with each successive 

 addition of CH 2 to the radical, so far as can be judged from 

 the examples quoted. The evidence is at present insufficient 

 to warrant speculation on this point. 



There is no doubt whatever that the law, at ail events in its 

 most obvious form, cannot be extended beyond the range of 



carbon compounds. 



To test the question, the values of ■— 



have been calculated for all the inorganic substances included 

 in Thorpe's research which fall into natural groups. The 

 results are given in Table IY. The first column contains the 

 formula of the substance, the second gives Thorpe's experi- 

 mental value for V T? the third gives his value for T, and the 



ratio 7|^ is given in the last column. 



