Chemistry and Phystes. wit 
the sodium line, after the telescope had been adjusted to the 
angle of minimum deviation of this line as first observed. 
There was seldom any observed difference in this angle. But 
when, by change of temperature, or otherwise, an itearatloa of 
two or three minutes had taken place, we found, on readjusting 
the cross-wire, that the relative position of the spectram lines 
was, to the limit of accuracy of our measurement, wholly un- 
change 
We give below the table of wave-lengtlis of the principal 
lines oft The arsenic spectrun 
6023 tenth-meters. 5230 tenth-meters. 
‘6 5195 te 
5853 5163 iy 
sis ca 
5743 4941 ee 
Bees i503 
5498 . 4493 . 
sy 4463 i 
Baca " 4313 i 
5245 < 
The wave-lengths printed in heavy type denote the bands 
which are most brilliant and give character to the spectrum. 
The other lines are less constant and less distinct, and in some 
instances may be due to accidental causes. 
e were surprised to find among the bright lines, that the 
one which in the table is enclosed in brackets corresponds to 
the green thalium band, and upon examining the spectrum it 
appeared evident that hatiack must be present in the arsenic 
in large quantities, as ne thalium band was fully as bright as 
any of the arsenic ban 
The diagram, fig. 3 “of Plate IV, gives some idea of the 
general appearance “of the arsenic spectrum. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
1. On oo Spontaneous Oxidation of Mercury and other Metals. 
—Berrtneror has submitted to experimental verification the ques- 
tion so she discussed eihbes final settlement, whether mercury 
dissolves the oxyge the air and ores s, even at ordinary 
Perfectl tly pure mereury wa laced in a ove aed 
