ELECTROLYTIC SYNTHESIS OF DIBASIC ACIDS. 



369 



C 2 H 5 C 2 H 5 



C 2 H 5 — C- 



-C— C 2 H 5 



0=C— 0— C=0 

 which represents the anhydride of tetraethylsuccinic acid. The character of the substance 

 rather points to the furfuran formula 



C 2 H 5 — C C — C H- 



II II 



C 2 H— O— C— O— C— O— C 2 H 5 



in which the replacement of all the hydrogen of the furfuran may perhaps account for the 



great stability of the ring. 



Dr Hugh Marshall kindly made a crystallographic examination of the substance, 



and has given us the following report : — 



System. 



Monosymmetric, a : b :c= 0*8811 : 1 : 0'9084 . |3 = 84° 27'. 



Forms observed. 



p={llO},o={lll}, c={00l}. 



Found. 



Calculated. 



*82° 30' 





*34° 38' 





*85° 50' 





62° 1' 



62° If 



81° 48' 



81° 45J' 



Table of Angles. 



Angle. 

 p:p' •(•110:110) 

 pro (110:111) 

 p:c (110:001) 

 o:o' (111:111) 

 o : p' (111 : 1T0) 



The crystals are generally in the form of longish prisms, or slightly tabular on a face 

 of p. They are colourless and transparent, and as a rule the faces are well formed and 

 smooth, giving good reflections. In almost every case the three forms above noted were 

 present, though occasionally c was practically absent, owing to the development of o. 

 There was no well-marked cleavage observable. 



VOL. XXXVII. PART II. (NO. 17). 3 H 



