Chemistry and Physics. AIT 
9. Nitrite of potash and sesquioxyd of cobalt. —StRomever has care- 
fully studied the beautiful yellow salt discovered by Fischer and some 
years afterward rediscovered by St. Evre. The author finds that the salt 
is insoluble in many saline solutions so that it may be washed with a 
solution of acetate of potash and afterward with alcohol ; in this manner 
it may be used for analytical purposes. Caustic soda and baryta water 
easily decompose it separating a brown hydrate of sesquioxyd of cobalt. 
The author finds for this compound the formula 
Co20s, 2NOs-+-3(KO, NOs)+2HO 
a 
2(Coz0s .2NOs)+-3(KO, NOs)4+3PbO, NOz)-+-4HO. 
Inn. der Chemie und Pharmacie, xcvi, 218. 
10. On the quantitative determination of Copper.—Mour has sug- 
ested the use of zinc in Ht 
solutions and proceeds as follows. A copper salt containing no nitric 
aci ; : 
The copper is speedily thrown down as a spongy mass and the liquid 
soon becomes colorlesss, hydrogen being evolved. More zinc is to be 
in the determination of copper, 
new but the manipulation, which appears to be advantageous. It must 
Skconp Sums, Vol. XXI, No, 63.—March, 1856. 53 
