Chemistry and Physies. 227 
boiling antimonic chloride. A portion of the white solid was ex- 
ed by Bouchardat’s method, and crystals of guanidine sul- 
phate were Proce from it. Another portion was evaporated to 
dryness with excess of barium hydrate in vacuo over sulphuric 
acid, the residue was extracted with absolute alcohol, the solution 
appearance of urea. Treated with sodium hypobomit and hy- 
ch 
owe aie the nitrogen evolved was nearly twice as much with 
¢ hypobromite. Ev vaporated with silver nitrate, silver cyanate 
odin pee out. eated in a tube, ammonia was evolved and 
the residue gave a strong reaction for biuret. Heated to 40° 
sey urea ferment, its solution became alkaline and gave off am- 
nia. Nitric acid and mercuric nitrate gave their characteristic 
dedaciics Hence the substance obtained is identical with ae 
nary urea, Direct tests showed that this urea existed as su 
the original white powder, and hence rendered it erebie that 
its isomer, the symmetrical carbamide CO} Nar is not formed 
* 2 
in the reaction.— J. Chem. Soc., xxxv, 798, Dec. 1879. G. F. B. 
3. On the Hydrocarbon Fluoranthene.—Frrria has published, 
of coal tar, aed has bee formula C,,H,,, intermediate 
phenanthrene 3 pyr CH” Separation from pyrene 
the fractional sryatallization of the picrates — te — 
to wit 
y fr, 
fractional cpemepeay’, in a partial vacuum was resorte 
success. ‘The vapor density of the pure fluoranthene was 6-638, 
theory requiring 6574 for C,,H,,. On oxidation with chromic 
acid, diphenyleneketone- carbonic “acid is the principal product, 
mix ixed, however, with a quinone. By conducting the operation 
with care, a mixture is obtained on the filter, of the acid, the 
quinone, and the unattacked hydrocarbon. Removi ing the ‘acid 
with sodium carbonate ee dissolving the residue in La alcohol, 
diphenic acid, C,H, : eo or ; Ono which on oxida- 
tion gives isophthalic acid, C,H, | COOH. Suspended in water, 
and treated with sodium amalgam, diphenyleneketone-carbonic 
