C. U. Shepard—Mineralogical Notices. 405 
‘The dust is then carried by this fan blower and driven into 
the top of the furnace. The minimum rate of delivery for a 
mill of ordinary size is 1500 pounds an hour. 
Of this last machine I can not give you a more minute account, 
as its successful operation depends upon interior details, obtained 
by long and costly experiment. The maximum rate of produc- 
tion we have not yet ascertained. 
All the new and important features have been patented by 
- Col. J. J. Storer and myself. 
_ As soon as possible, I will furnish you with working plans of 
the furnaces built and worked by us. We have ground the 
hardest copper ores of Vermont and the quartz of Nova Scotia 
In our pulverizing mills. I know of none more difficult of re- 
duction, 
Boston, Mass., March 5th, 1864. 
Art. XXXIX.— Mineralogical Notices; by CHaRLEs UPHAM 
| SHEPARD, of Amherst College. 
Ores of Antimony.—This metal is rather recently made known 
to us as entering into the mineral wealth of this continent. The 
antimonite has been reported from a place called Soldier's De- 
ight, in Md.; and from Carmel, in Penobscot Co., Me. About 
teen years ago, very distinct specimens, though in small quan- 
ity, were brought to me from Cornish, N. H., by Prof. F. Shep- 
herd. The Breithauptite has for several years been known as 
existing at the Chatham (Conn.) nickel mine. But at neither 
these localities was there any flattering promise of the metal 
In workable quantity. It now, however, promises to be pro- 
duced from more than one American locality. Beside the South 
Ham, C. E., mines of antimony, of which a notice is here sub- 
mitted from C. H. Hitchcock, Hsq., as the result of a very recent 
Strvey, we find mention made of two other localities in his 
~~. report on the geology of the State of Maine (1863), one 
of these being in the Province of New Brunswick and the other 
in the eastern part of Maine. 
t. Hitchcock, in presenting me with his notice of the South 
Ham Mines, submitted also several other ores of antimony un- 
Enown on this continent before the discovery of this mine, a de- 
“nption of which I append to his account. 
nif. Hitchcock's Statement on the Antimony Mine of South Ham, 
¢ £—The rocks are the common talco-micaceous schists of the 
uebec Group of the Lower Silurian. The strata run N, 55) 
‘ 
