402 Scientific Intelligence. 
Sulphur calculation. Atomic ratio. 
Ss *8356 °8356 
As 8°57 Sb 0743). 
Ag 5 As 1785 basket 
Cu 9°87 Ag, ‘0179 
Fe 3°12 Cu, 3083 E 
Zn 1-06 fe nt 
— Zn 0330 
26°75 
From the above is obtained the ratio 
2528 R,S,+°9134 RS, or R,S,+3°6 RS. 
The method employed in the analyses was that of H. Rose, 
except in the determination of the arsenic. On account of the 
ifficulty in weighing magnesium ammonium arseniate, after 
separating by means of magnesia mixture and alcohol the pre- 
cipitate was dissolved in dilute hydrochloric acid, reduced by 
sulphurous acid, the excess of the latter was evaporated off, 
and the arsenic precipitated and weighed as sulphide. A slight 
amount of free sulphur was dissolved out by carbon-disulphide. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PuHysiIcs. 
cool and the solidifying point noted; this operation being te- 
peated several times. In thi 
Ch., TI, xxxi, 155, Feb. 18 G. F. B. 
2. On Chromium, Manganese, Iron, Nickel and Cobalt Amal- 
gams.—Morssan has shown that when a concentrated solution of 
chromous chloride in water is agitated with a pasty sodium amal- 
gam there is produced a chromium amalgam. After removal of 
the excess of sodium by boiling in water for an hour, the amal- 
gam is obtained as a liquid, less fluid than mercury, covering 1t- 
self on standing in the air with a black layer of oxide, decompos- 
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