746 



Mr. Gervaise Le Bas on the 



II 



The following is a diagrammatic representation of the 

 above constitutive effects, the upper curves being for the 

 isomers 8 H 16 2 , and the succeeding ones those for the 

 isomers C 7 H u 2 "and C 6 H 12 2 respectively. 



Volumes (Values of v /w) 



3-70 



3-62 



C 



170° 



o 



160 



o 



150 

 140° 



G 



130 

 J20 



-0CH 3 -0C 3 H 7 -0C 5 H„ -0C 7 H, 5 



Boiling Points 



Cs < 



S 





































































































The two families of curves are evidently related. ^ That 

 constitutive peculiarity which occasions an augmentation in 

 the volumes depresses the boiling-point and viceversa. 



These effects are usually attributed to Symmetry— that is, 

 to similarity or dissimilarity in the and C radicles.^ In any 

 case the simple radicles CH 3 , C 2 H 5 , &c. in association with 

 more complex radicles produce remarkable diminutions in 

 volume according to the preceding diagrams, and corre- 

 sponding elevations of the boiling-point. 



