Notice of Warwickite. 313 
one 8, a, Greenwich — 4h. 51m. — W. — 
Cambridge ; 
* “ Edinburgh & ~ &“ 
ouglt 6, “ Greenwich ss 28 bs 
é Edinburgh “ ; 93 <4 
July 7, “ Greenwich “ie 43 Sel 
ed 4, “ Greenwich 44 #4 
“ — Cambridge 43 $ 
Ag. 9, “  ! Aquarii as 77 os 
“& 2? Aquarii & 58 ‘“ 
Sept. = 1811, Solar eclipse “ 51 ts 
The mean of these thirteen determinations is 4h. 51m. 43s., 
and the mean difference is + 10.5s._ If we reject the observation 
of t' Aquarii, as I think we must, the mean longitude will be 4h. 
51m. 40.5s., and the mean difference, + 8.9s. 
I think tharatiee we may assume for the Observatory of Yale 
College, 
North Latitude, 41° 18’ 28”. 
West Longitude, 4h. 51m. 40s. 
and I believe these values may be regarded as tolerable approxi- 
mations to the truth. 
Arr. V.—WNotice of Warwickite, a new mineral species; by 
Cuartes Upnam Sueparp, M. D., Prof. of Chemistry in the 
Medical College of the State of South Carolina. 
Tue mineral here announced, is one which has for many years 
been known to the mineralogists of this country as occurring 
at Warwick, Orange county, N. Y., where it exists in limited 
quantity along with brucite and yellow idoerase, imbedded in a 
highly crystalline white dolomitic limestone. It has passed un- 
der the name of hypersthene, on account of the very brilliant 
copper-red reflections afforded by its cleavage planes. The size 
of the crystals at the locality first discovered, is in general very 
diminutive,—they for the most part being quite slender, and only 
@ quarter or half an inch in length. A second depository of the 
mineral however, was observed by Drs. Youne and Horron in 
Vou. XXXIV.—No. 2. AQ 
