92 B, Silliman on a peculiar mode of occurrence 
to which the earth was then moving. The earth passed the 
node of the group on the morning of either the 22d or the 23d 
of October, and one of the most remarkable of star showers was 
witnessed in Europe between the hours of matins and primes.* 
The two comets traversed in the sky a course along which the 
meteor group would, if visible, have been seen projected. 
If this explanation of the Chinese account be the true one, 
‘we cannot say that either of these two comets is the same as 
reached us too late for this article. Numerous observations for 
parallax made at Washington, Germantown, Haverford, the 
Palisades, Poughkeepsie, Stamford, New Haven, Williams- 
town, Hanover, and Cambridge, need comparison and reduc- 
tion before they can be of use. We hope to resume the sub- 
ject in a future number. H, A. N. 
Art. XVI.—WNotice of a peculiar mode of the occurrence of 
Gold and Silver in the Foot-Hills of the Sierra Nevada, and 
especially at Whisky Hill, in Placer county, and Quail Hill, 
in Calaveras county, California; by B. Stnuman.t 
In the search for ores of copper which occurred in California 
in what is now known as the “‘ Copper Belt” of the Lower Sier- 
ras, deposits of “Iron Rust,” as they were called by the miners, 
were observed at numerous points far below the range of the 
main gold belt of the Sierras, Several of these ochraceous de- 
So had been previously “located” by prospecting miners 
‘or gold, before there was any knowledge, or suspicion even, 
of the existence of ores of copper in connection with them. 
It was a matter of common observation that certain gulches, 
