Chemistry and Physics. 125 
dilute sulphuric acid and hypermanganate potash is then to be added, the 
flask closed and strongly shaken for two or three minutes. The un 
composed hypermanganate of potash is then to be removed by a solution 
of oxalic acid, and the excess of this last determined by means of a titred 
solution of the hypermanganate. The percentage of mercury is then 
easily caleulated——Ann. der Chemie und Pharm. evil, 97. 
. On the Iodid of Methylen—When powdered iodine is {added to 
crystallized ethyloxyd-soda a strong reaction occurs, and the mass be- 
comes fluid. By distilling the mass Buttlerow obtained a heavy oily 
substance dissolved in alcohol and precipitated from this by water: this 
is the iodid of methylen C2H2I2. The same substance is formed in larger 
quantity when one eq. of iodoform C2HIs is added to three eqs. of ethyl- 
ie ie : By: 
This is the acetate of methyl-glycol (CilTs02)2 Os. The author did 
not however succeed in obtaining methyl-glycol from this body.—Ann. 
der Chemie und Pharmacie, evii, 110. : 
4. On the action of Ammonia upon Glyoxal—By the action of nitric 
acid upon alcohol Dezus obtained two new bodies termed respectively 
glyoxal CsH20« and glyoxylic acid CaH4Os. By the action of a warm 
and concentrated solution of ammonia upon glyoxal, Debus obtained a 
oye having the formula Ci2H6Na, its formation being represented by the 
equation 
3(CaH204) + 4NHs = CieHeNs + 12H. 
Glycosin the new base is a light white powder soft like tale and without 
taste or smell: it sublimes without melting, and yields beautiful needles. 
With bichlorid of platinum it yields a beautiful yellow crystalline powder, 
Which has the formula Ci2HsNa + 2(HCI, PtCl2) or Ci2HsN«Cls, 2PtCls. 
The rational formula of glycosin according to Debus is 
2 
Na 4 CaH2}. 
CaHa : 
The mother-liquor from which the glycosin is obtained yields with oxalic 
im Magnificent orange-red prisms. The formation of glyoxalin is ex- 
y the equation 
2(CsH204) + 2NH3 = CoH2No + C2H204-+ 4H0. 
Ann. der Chemie und Pharmacie, evii, 199. i 
5. On the constitution of Tantalite—H. Rose has published an elabo- 
rate discussion of the analyses of tantalite from different localities, and 
ge at the conclusion that the formula of the unaltered mineral is 
e0, 2TaQs, a portion of the tantalic acid being replaced by —. 
