328 J. H. MAIDEN AND H. G. SMITH. 
ment was not resorted to until qualitative tests had satisfactorily 
indicated that the acid was succinic acid only.) By boiling the 
sublimate with water, the succinic anhydride formed at the tem- 
perature needed for sublimation is converted into the ordinary 
acid, as is proved by the melting point, the sublimate before 
boiling with water melting at irregular temperatures between 
125° C, to 150° C., while the normal acid, as obtained in crystals, 
melts at 177° C. to 178° ©. uncorrected. As the melting point 
was determined in an open beaker in glycerol, the actual temper- 
ature for the column of mercury could hardly be accurately taken 
for correction of melting point, so the figures are given as obtained, 
but the melting point may be considered as closely approximating 
180° C. The crystals are acid to the taste. The adherent mois 
ture was removed from the crystallized acid by ‘heating on the 
water bath before taking samples for combustion. The combus- 
tions were made of the acid obtained as pure as possible, absolutely 
free from residue on ignition, and melting at 178° C. uncorrected. 
2090 gram. gave ‘3097 gram. CO, 
and -1000 gram. H,O 
equal to 40°413 per cent. carbon 
5°316 s hydrogen 
54:271 o oxygen 
100-000 
equal to 3°368 C. 
5-316 
3392 O. 
from which we may deduce the formula C,H,0,, whichis eet 
succinic acid. 
Another combustion gave almost identical results. 
Theory gives for C,H,O, 
54°238 0. 
100-000 © 
