VOLATILE ACIDS. 195 



TABLE XXXIV. DISTILLATION OF VOLATILE ACIDS. 



would appear in this fraction, and the last because experimental 

 error is greatly magnified, and these should only have half 

 weight ; but usually the other ratios are practically constant 

 for either butyric and acetic acids, or butyric and propionic 

 acids. 



The distillation of the third of a third is undertaken in order 

 to decide definitely the composition of the mixture. From a 

 number of experiments it has been found that the proportions 



