63c 



TKAXS. ST. LOUTS ACAD. SCIENCE. 



Butyric Acid. 

 Determinations made at 25° C. 

 The boiling point of the butyric acid was 163.3^ C. corrected. 



For butyric acid a maximum of condensation is found to take 

 place in the formation of the fourth hydrate, from whence the 

 curve gradually approaches the zero line of no condensation. 

 The specific gravity of a mixture of butyric acid and water hav- 

 ing the composition C^HgO^ -I-6H2O is 1,000. Mixtures con- 

 taining less than this amount of water have specific gravities less 

 than one, whilst those containing more than this amount have 

 specific gravities greater than one. When the mixture has the 

 composition C4H8O2 + 20H2O the specific gravity is a maxi- 

 mum, being 1.0047. 



COMPARISON OF THE CONDENSATIONS OF THE DIFFERENT ACIDS. 



The similarity of these condensation curves is apparent. They 



