18 



THE ROYAL SOCIETY OF CANADA 



propylene and trimethylene glycol. They all resembled the true 

 glycerol esters by crystallising in thin shiny plates of irregular outline, 

 their leaf-like crystals often arranging themselves in rose-like masses. 

 The stéarates of the three series had a higher melting point than 

 the corresponding palmitates and the saturated esters were higher 

 than the corresponding mono-derivatives. 



There was a marked difference in the melting points and the 

 solubility of the esters of the two isomeric propylene glycols. The 

 mono-derivatives were more soluble than the di, and the palmitates 

 much more so than the stéarates. The optimum temperatures 

 of Esterification were lower for the ethylene glycols than for the pro- 

 pylene alcohols. The principal properties of these glycol esters of 

 stearic and palmitic acids are tabulated below for easy conipaiison. 



The writer wishes to thank Professor Ruttan for kind suggestions 

 and assistance. 



McGill University, 



Department of Chemistry. 



