28 



Dr. Bevan Lean on the 



Succinic Acid '00665. 



Methyl- 



Ethyl- 



Propyl- 



Benzyl- 



•0086 

 •0085 

 0089 

 •0091 



Dimethyl- 



Diethyl- 



Methylbenzyl-. . . 

 Ethylbenzyl- . . . 



Anti. 



Para. 



•0122 

 •0245 



'0204 



•0343 

 •0219 

 •0261 





Glutaric Acid '00475. 



Methyl- 



Ethyl- 



Propyl- 



Benzyl- 



•0052 



Dimethyl- 



Diethyl- 



Methylpropyl . . . 

 Methylbenzyl . . . 



Anti. 



Para. 



'o°5 3 

 '0055 



•0055 



•0055 

 •0059 





Pimelic Acid. '00357 1 . 





Dimethyl- 



Diethyl- 



Dipropyl- 



Dibenzyl- 



•00339 



•0034S 



•0032 



'0048 



Whilst there are some irregularities which require ex- 

 planation, the figures in the above tables bring out clearly 

 the fact that an increase in the conductivity of a dibasic 

 acid is effected by the introduction of alkyl-groups, and the 

 heavier the group, the greater is its influence. The benzyl 

 group, on account of its mass, and probably still more by 

 reason of its acid character, appears to have an especial 

 influence. 



1 The dialkyl pimelic acids have not been separated into two modifica- 



tions. 



