350 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Quite recently, de Hemptinne * has determined the solubilities of 

 several esters in water at 25°. His measurements are given in grams 

 of the solute per litre of solution. I have reduced his measurements 

 to cubic centimeters of solute in ten cubic centimeters of solvent by 

 dividing by the densities as far as I could get them out of Landolt and 

 Bernstein's tables and Roscoe and Schorlemmer's text-book, disregard- 

 ing the difference between a litre of solution and a litre of solvent. 

 The results which I give in Table XVII. are only rough approxi- 

 mations, but quite sufficient for my purpose. The figures in the second 

 column are the densities used in recalculating de Hemptinue's figures. 



XVII. 



De Hemptinne did not measure the solubility of water in the esters, 

 and I have not been able to find any data on the subject beyond 

 the few measurements which I have made myself. In considering 

 Pfeiffer's results, this is not very serious, because he worked always 

 •with three cubic centimeters of esters, adding alcohol in varying quan- 

 tities, and water to saturation. As the solubility of water in the 

 different esters can be rarely more than one per cent, the error in 

 calculating the amount of water required to saturate will in no case be 

 more than a tenth of a cubic centimeter, and will rarely exceed two or 

 three hundredths. The solubilities of esters in water, which have not 

 been determined by de Hemptinne or myself, have been filled in as 

 best I could by analogy, remembering that increase of carbon means 

 decrease of solubility, and that among isomeric esters the one with the 

 smaller acid radical was rather the less soluble. In deciding where 

 between two limits an unknown solubility should be put, I have taken 

 the figure which satisfied the experimental data best. The solubilities 

 thus obtained lay no claim to being accurate ; but they are not very 

 far out, probably in no case more than 100%, and this rough approxi- 



* Zeitschr f. ph. Chem., XIII. 561. 1894. 



