428 



iMeÜnjlisohutyratc. 

 Elhylisobutyrute. 

 Isobutylisohuiyrate. 



\ Isobutylcyanoacetate. 

 \ Amylcyanoacetate. 

 1 BiUylcyanoacetate. 

 I Propylcyanoacetate. 

 ' Ethylcyanoacetate. 

 Methylcyanoacetate. 



10. 



14. 



Acetone. 

 Methylpropylcetone. 



SBiethyloxalate. 

 Diethylmalonate. 



6. 



Ethylacetyloacetate. 

 Elhylpropyloacetate. 



Dimethyltarirate. 

 Diethyltartrate. 



7. 



Trichloromethane. 

 Tetrachloromethane. 



11. 



Benzene. 



Toluene. 

 1> Xylene. 



Mesitylene. 

 Pseudocumene. 



12. 



Nitrobenzene. 

 o-Niirotoluene. 



13. 



Aniline. 

 o-Toluïdine. 



Amsol. 

 Phenetol. 



15 1 



l Peaorcinemonomethylether. 



Resorcinedimethylether. 



iMethylsalicylate. 

 Ethylsalicylate. 

 Phenylsalicylate. 



18. 



IMethylbenzoate. 

 Ethylbcnzoate. 

 Benzylbenzoate. 



Pyridine. 

 x-Picoline 



By such a comparison of the results obtained we can now derive 

 the evidently general fact, that the values of the molecular surface 

 energy at the same temperature increase in homologous series, if ive come 

 to terms of higher hydrocarbon-radicals. Although quantitative relations 

 do not so strikingly come to the foreground, it seems however to 

 be clear, that the influence of the .same increase in this respect, 

 becomes smaller within the series, if the molecular weight of the 

 compound increases; a fact, that must be thought also completely 

 comprehensible. In most cases these rules hold, as the following 

 instances may prove: The value of ft is at the same temperature 

 greater for isohutijl-alcolLol, than for normal propylalcohol, and here 

 again greater than with eihylalcohol : just so \v'üh ethi/lacetate gresiier 

 than with ethglformiate. with amylacetate greater than with the 

 corresponding ethyh\\\Qv; it is greater for isohuthyl-isohuiyrate than 

 for the ethylether, and here again greater than for methylisohutyrate ; 

 with ethyl-propylacetyloacetate greater than for ethyl-aceiyloacetate. 

 In the series of the six cyanoacetates, the value of ft is greatest with 

 the am///-ether, and decreases here regularly within the series till 

 the methyl-ethev is reached, while the temperature-coefficients remain 

 almost the same; the isohutf/l-e\\\ev however has another value for 



dft 



— , and values for ft, which are only partially greater than for the 



