Notice of Warwickite. 313 



June 85 1835, Greenwich observation, 4h. 51m. 45s. W. long. 



" " Cambridge 



" " Edinburgh 



July 6, " Greenwich 



" " Edinburgh 



July 7, " Greenwich 



Aug. 4, " Greenwich 



" " Cambridge 



Aug. 9, " T* Aquarii 



li 



T' 



Aquarii 



Sept. 17, 1811, Solar eclipse 



The mean of these thirteen determinations is 4h. 51m. 43s.5 

 and the mean difference is =h 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, zh 8.9s. 



I think therefore 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. 



Art. V. — Notice of Warwickite, a nevj Qiiineral species; by 

 Charles Upham Shepard, M. D., Prof, of Chemistry in the 

 Medical College of the State of South Carolina. 



The 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 idocrase, 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 

 a quarter or half an inch in length. A second depository of the 

 mineral however, was observed by Drs. Young and Horton in 



Vol. XXXIV.— No. 2. 40 



