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If the ore to be examined be not an ore of lead, some of the 
ore is to. be melted in a clean crucible which has never been 
used, and lead free of -silver-and gold added, and stirred. and 
mixed with the fused ore. The fusion of the ore should be so 
ety as to permit the lead to settle to the bottom of the melted 
The lead, in consequence of its affinity for the precious 
ssi unites with them if present, and forms an alloy. The 
lead, cupelled asabove, will show the silver or gold, or an alloy 
of them, if either, or both of them were present 
If the globule obtained by the cupelling aposabion, beg 
to-be an alloy of silver and: gold, it is examined in the usual way, 
_ and the metals separated qualitatively, | or quantitatively, as cir- 
cumstances may require. 
Albany, Oct. 2d, 1838, 
%. 
Arr. X. —Meteri Observations made at Cambridge, Mass. ; ; 
' by Prof. J. Loverme. 
: THE science of meteorology, although it has eoopived of has a 
large share of public attention, still remains in an unsettled and 
erude state. The rigorous demonstrations of mathematics, which 
have been called ‘in to elucidate and develope the other sciences, 
have failed in any important degree to reach and establish this, 
A disposition to speculate; a disinclination to keep up steady ob- 
servations, has been felt as a constant impediment to-the growth 
of this department of science. It is not till very- recently, that 
any regular and systematic plan of observations has been adopted : 
and yet we might have supposed that the mighty impulse given 
- to astronomy by the establishment of fixed observatories, would 
have suggested similar means for the advancement of other sci- 
- ences equally dependent upon constant observations. Instead of 
complaining, however, that we did not have them sooner, per- 
haps we ought rather to-rejoice that such means are now in ope- 
ration, and that a mass of observations is continually sent forth 
from these established retreats, which must soon give a more- fin- 
ished character to the complicated and difficult science of me- 
teorology. 
A good proportion of this attention has. been vues by that 
class of transient and luminous appearances, either in or very near 
