Chemisiry and Physics. 111 
yields phthalic, oxalic, and chlorohydric acids. The authors however, 
did not perfectly succeed in transforming chloro-naphthalic into alizarin, 
either by Melsen’s or by Kolbe’s method of replacing chlorine by hy- — 
drogen; they invite the attention of other chemists to the subject, and 
point out the practical advantage which would accrue from a metho 
of converting naphthalin into alizarin. 
Purpurin crystallizes from its solution in strong alcohol in red 
needles; from weak alcohol on the contrary, in fine, soft, orange- 
Laurent long since showed that chloro-naphthalic acid by oxydation ‘ 
C,H, 
.;H,O,. The hydrate has the formula C,,H,O,+- 
- Purpurin contains therefore 2 eqs. less of carbon than alizarin 
and it is highly probable that the latter may be converted into the 
former by oxydation. As shown by the equation, 
C,,H,0,+HO-+0,—C, ,H,0,+C,HO,. 
Purpurin with nitric acid yields phthalic and oxalic acids.—Annalen 
] 1850 
der Chemie und Pharmacie, \xxv, 1, July : 
0. Action of Sulphite of Ammonia.—Pir1a has found that sulphite 
0, 
2 that of Debus C..H.O 
O 
cylic acids. By the action of a concentrated solution of the sulphite 
upon an alcoholic solution of nitro-naphthaline two new isomeric acids 
are obtained in combination with ammonia. ‘These the author terms 
—Comptes Rendus, xxxi, 489, 30:h Sept., 1850. 
[Vote.—The naphthionic and thionaphthamic acids of Piria may be. 
regarded as “ amic acids” analogous to aminsulphuric acid, SO,,. o+ 
| r S,0,NH,+HO, oxamic acid, &c.  Piria’s acids on 
N C,,H,; if naph Re : 2 a eehiditnile on 
1, ; if naphthalidin be considered as ammonia In which one eq, 
of hydrogen is replaced by one eq. of CzoH,, the body NC,,H, 
