395 



Chemistry. ~ ''The Temperature-coefficients of the free Surface- 

 energy of Liquids, at Temperatures from — 80° to 1650° C: 

 IV. Measurements of some Aliphatic and Aromatic Etheis." 

 By Prof. F. M. Jaeger and Jul. Kahn. (Commnnicated by 



Prof. P. VAN ROMBURGH.) 



^ 1. In tliis communication the results obtained in tlie measure- 

 ments of the free surface-energy of a number of ethers, are recorded 

 by us. With respect to the puritication-niethods and tlie determina- 

 tion of the specific weights, we can refer to communication II of 

 this series^); also the arrangement of the data and the significance 

 of the diagrams are completely the same as indicated before. 

 This series includes the following aliphatic terms: 



Amylacetate ; Diethyl- Oxalate ; Biethyhnalonate ; Diethylbromo- 

 malonate; Diethyl-Ethylbenzylmalonate; Dimethyl and Diaethyltartrates; 

 and the following aromatic substances : 



ortho-Nitroanisol; Methyl-, Ethyl-, and Phenyl- Salicylates ; Methyl- 

 Cinnamylate. 



1) F. M. Jaeger and M. J. Smit, These Proc. (1914) p. 365. 



