1890 - 91 .] Prof. Brown and Dr Walker on Dibasic Acids. 97 
II. *1224 gr. acid, melting-point 130° C., gave *2465 gr. C0 2 
and '0894 gr. H 2 0 
Calculated for C 8 H 14 0 4 
55*17 j 
8-11 
The acids have thus the composition of diethylsuccinic acid, 
and from their mode of formation are symmetrical. Two sym- 
metrical diethylsuccinic acids were prepared by Bischoff and Hjelt, 
which are evidently identical with ours, viz., para-s-diethylsuccinic 
acids, melting-point 192°, with decomposition, and anti-s-diethyl- 
succinic acid, melting-point 129°. We found the following values 
of the dissociation-constants of the two acids : — 
Para-acid, K = *0237 (K='0245, Bischoff and Walden). 
Anti-acid, K = -0347 (K = -0343 u m ). 
Found. 
I. II. 
C 55-11 54-93 
H 8T2 8-12 
VOL. XVIII. 
29/4/91 
G 
