334 



MESSES. E. FEANKLAND AND B. F. DUPPA'S 



Ethylic diamyloxalate closely resembles the two foregoing ethers in its appearance and 

 properties. It is, however, a thicker oil, and flows less readily, and has the lowest 

 specific gravity of any ether belonging to this series, its density at 13° C. being only 

 •9137. The following comparison of the specific gravities of all the ethers of this series 

 shows that they generally increase inversely as their atomic weights : — 



Ethylic diamyloxalate boils at about 262°, and distils with little or no change. A 

 determination of the specific gravity of its vapour gave the following numbers : — 



Weight of ethylic diamyloxalate -2043 grm. 



Observed volume of vapour 56-78 cub. centims. 



Temperature of bath ............. 273° C. 



Height of barometer . 769 millims. 



Difference of heights of mercury inside and outside tube . . 70 millims. 

 Height of spermaceti column reduced to millims. of mercury 14 millims. 



From these data the specific gravity 5-9 was deduced, whilst the above formula 

 requires 8-4. The investigation of these ethers has revealed a tendency to dissociation, 

 increasing with the weight of the atoms replacing the atom of oxygen in ethylic oxalate. 

 Thus, beginning with ethylic lactate, which has the normal vapour-density, we find a 

 gradual divergence culminating in ethylic diamyloxalate, as seen in the following series 

 of numbers : — 



Name. 



Ethylic lactate C, 



Ethylic dimethoxalate . . , 

 Ethylic ethyl-lactate .... 

 Ethylic ethomethoxalate . . 

 Methylic diethoxalate . . 

 Ethylic diethoxalate .... 

 Ethylic amylhydroxalate . . 

 Ethylic ethyl-amylhydroxalate 

 Amylic diethoxalate .... 

 Ethylic diamyloxalate . . . 



