i 
F’, A, Genth’s Contributions to Mineralogy. 247 
with the results of my examinations, did not comply with my 
= and I hope others may be more successful than I have 
en. 
2. Native Bismuth. 
A fragment of the beautiful variety of Bismuth from the Peak 
of the Sorato, in Bolivia, S. A., where it occurs in masses of a 
broadly laminated structure, the foliz frequently interlaminated 
with films of native gold, has been presented to me by Chas. 
. 
M. Wheatley, Esq., and was found to contain: 
Bismuth, x = - 99°914 
Tellurium, % - - + - - 0 042 
n, . i . é ‘ . - trace 
99°956 
3. Whitneyite. Am. Journ. Sci., [2], xxvii, 400, 
In his Report on Lake Superior, Washington, 1849, p. 447, 
Dr. C. T, Jackson makes the following observations. ‘ Aung. 
8d, 1848. Crossing over the summit of the cliff and descending 
a few rods on the slope, we came to a little vein, which was sup- 
d to be antimonial copper ore, but which, by blowpipe 
analysis, gave only arsenic and copper.” This passage having 
€scaped my notice at the time of writing my paper, I have not 
done Dr. Jackson full justice before. It is very probable that 
Dr. Jackson had my new species (Whitneyite) im his hands as 
early as Aug. 3d, 1848, (although he having failed to give an 
analysis of the same, there is no positive evidence of it). It is 
certain that he had a mineral, in which by blowpipe tests he 
found oniy arsenic and copper; but he does not express his opin- 
1on about it or its claims as a mineralogical species—and there- 
fore, if he has been aware of the true nature of this interesting 
mineral, he has done an injustice to himself and science by not 
publishing his views about it. ) 
; learned an investigator as Dr. Jackson could not have been 
ignorant that it was Domeyko, who first in 1843, described and 
analyzed the mineral which bears his name and proved the exist- 
ence of arsenids of copper in nature which had not been recog- 
nized by Faraday, and von Kobell by their analyses of the same 
mineral in its impure and partly oxydized state of condurrite. _ 
It is by no means certain, however, that the mineral noticed 
by Dr, J ackson, in 1848, was not the arsenid of nickel and cop- 
Per noticed in this Journal, [2], xix, 417, by T.S.. ‘unt, 
4gan on p. 15, this vol, by Prof: Whitmey. 
. This species, of which Breithaupt under the name of Homich- 
lin gives a eat many socmioadar prediaied, when first observed, 
to bee: avery important copper ore of North Carolina; it 
