Robertson. — Distillation of Fatty Acids. 



ovo 



mixture in each case was found to contain the palmitic and 

 stearic acids in the same proportion. 



62 



S6 



S4 



JO 



-?o 



42 



38 



34- 



Tig 



O 20 



fO SO 



2YO OLeic/ AaCeL • 

 ZS/i, „ x 



40'/. .. o 



The next characteristic point in the curve is at Y (see 

 rig. 1), where the freezing-point reaches its maximum value. 

 The sudden fall that follows is due to the formation of new 

 compounds of non-acid nature. This fact is well illustrated 

 by a consideration of the curves in fig. 5, where the freezing- 

 points and the weights of substance required to neutralise 

 1 e.c. of N/20 caustic soda are plotted on the same diagram. 

 At the point where the freezing-point curve suddenly falls a 

 rapid rise occurs in the other curve. 



Experiments were then performed to investigate the nature 

 of the new compound or compounds that had been produced. 

 A sample of the last fraction was extracted with boiling 

 alcohol several times, whereby all the acids were removed. 

 There was left a dark- brown mass which melted under boiling 

 alcohol. This proved to be a mixture which was separated 



