I.UEDEKING PHYSICO-CHEM. STUDIES IN FATTY ACID SERIES. 635 



The figures and the curve show that the values c c' attain a 

 minimum on addition of the first half equivalent of water. Then 

 these values rapidly reach a maximum at the second hydrate. A 

 slight minimum is then reached, to be followed by a second 

 greater maximum at the fourth hydrate. At the sixth hydrate 

 there seems to be another slight minimum. The values cW then 

 gradually approach unity in value. 



Pkopionic Acid. 

 Specific heat between 50° and 22° C. 



The propionic acid used was the same as that used in the spe- 

 cific gravity determinations. 



The figures and the curve for propionic acid show that the 

 values cic' very abruptly reach a maximum at the second hydrate 

 and then sink to a minimum at the fourth hydrate. A second 

 maximum then follows at the sixth hydrate. At the tenth hydrate 

 a second minimum seems to occur, followed by a slight increase, 

 whereupon the values dc' gradually approach unity. 

 Butyric Acid. 

 Specific heat between 50° and 23 C°. 



The butyric acid used was the same as that used in the spe- 

 cific gravity determinations. 



