iUEDEKING PHYSICO-CHEM. STUDIES IN FATTY ACID SERIES. 627 



lieaded p gives the percentage of acid contained in the various 

 mixtures ; column 6" gives the specific gravity as found ; column 

 ..S"' gives the specific gravity of the mixtures as calculated under 

 the assumption that the constituents exercise no action upon one 

 another, and enter with their original volumes into the mixture 

 by the formula — 



5' 



VJC -f- -MC 



in w^hich iv and w' signify the weights used, and c and c' the 

 specific gravities of the constituents. The column headed S i S' 

 serves to show the progress of the condensation. In Fig. II. are 

 given in a curve these values 6'|6'' as ordinates, and the corre- 

 sponding equivalents of water n added as abscissas. 

 Formic Acid. 

 The boiling point of the formic acid used was 100.3^ corrected, 

 and its solidification point 0°. 



The determinations were made at 22*^ C. 



-4-6 



