1865.] of the Lactic Series. 195 



Name. Formula. Sp. gr. Temp. 



Ethylic lactate C 6 H 10 O 3 1-042 13 



Ethylic dimethoxalate C 6 H 12 O 3 0'9931 13 



Ethylic ethyl lactate C 7 H u O 3 0'9203 



Ethylic ethomethoxalate C 7 H u O 3 0-9768 13 



Methylic diethoxalate C 7 H u O 3 0-9896 . 16-5 



Ethylic diethoxalate C 8 H 16 O 3 0-9613 187 



Ethylic amylhydroxalate C 9 H 18 O 3 0'9449 13 



Ethylic ethyl- amylhydroxalate C u H 22 O 3 0'9399 13 



Amylic diethoxalate C u II 22 O 3 0*9322 13 



Ethylic diamyloxalate C 14 H 2y O 3 0-9137 13 



Ethylic diamyloxalate boils at about 262, and distils with little or no 

 change. The specific gravity of its vapour was found to be only 5- 9 

 instead of 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 oxalic ether. Thus, beginning with lactic ether, which has the 

 normal vapour-density, we find a gradual divergence culminating in ethylic 

 diamyloxalate, as seen from the following series of numbers : 



Vapour-densities. 



Name. 



Formula. ^ 



Calculated. Found. 



Ethylic lactate C 5 H 10 O 3 4-07 4-14 



Ethylic dimethoxalate C 6 H 12 O 3 4'56 4'67 



Ethylic ethyl lactate C 7 H 14 O 3 5'03 5-052 



Ethylic ethomethoxalate C 7 H 14 O 3 5-03 4'98 



Methylic diethoxalate C 7 H 14 O 3 5'03 4'84 



Ethylic diethoxalate C 8 H 16 O 3 5-528 5'24 



Ethylic amylhydroxalate C 9 H 18 O 3 6-01 5'47 



Ethylic ethyl-amylhydroxalate C u H aa O, 6'92 6-29 



Amylic diethoxalate C U H 22 O 3 6-92 674 



Ethylic diamyloxalate C 14 H 28 O 3 8'4 5'9 



We have likewise prepared the acids corresponding to the three 

 ethers above mentioned. The first is obtained by decomposing ethylic 

 amylhydroxalate with baryta, treating the solution of the barium-salt thus 

 obtained with excess of sulphuric acid, and then dissolving out the organic 

 acid with ether. On evaporating the ethereal solution, the acid remains as 

 a thick oil which does not crystallize after several days' exposure over sul- 

 phuric acid in vacua. The calcium- and barium-salts form white crystalline 

 masses, which exhibit respectively the composition 



and 



i O 



Ca" 



