xxxvii C-O N T EN T S, 
N°, 
XIX. Afronomical Obfervations. Communicated by David Ritten- 
houfe. 
XX. A Letter from Dr. Rittenhoufe zo Mr. Patterfon, relative to 
a method of finding the fum of the feveral powers of the Sines, Sc. 
XXI. Index Florae Lancaftrienfis, auftore Henrico Muhlenberg, D. D. 
XXII. Inveftigation of the Power of Dr. Barker’s Mill, as improved 
by James Rumfey, with a defcription of the Mill, by W. Waring. 
XXUI. 4 Thermometrical Fournal of the temperature of the Atmof- 
phere and Sea, on a voyage to and from Oporto, with explanatary 
obfervations thereon, to David Rittenhoufe, L. L. D. Prefident of 
the American Philofophical Society. 
XXIV. Firft Memoir of Obfervations on the Plants denominated 
Cryptogamick. By M. De Beauvois. 
XXV. A Letter from Major Jonathan Heart, zo Benjamin Smith 
Barton, M.D. Containing obfervations on the Ancient Works of 
Art, the Native Inhabitants, {S'c. of the Weftern Country. 
XXVI. An Account of fome of the principal Dies employed by the North 
American Indians. Extraéted from a paper, communicated by the 
late Mr. Hugh Martin. 
XXVIL. An Account of the beneficial effects of the Cafia Chamacrifta 
in recruiting worn-out lands, and in enriching fuch as are naturally 
poor: together with a botanical defcription of the plant. By Dr. 
James Greenway, of Dinwiddie-County, in Virginia. 
XXVIN. An Account of a Hill, on the borders of N. Carolina, fup- 
pofed to have been a Volcano. Ina Letter from a Continental OF 
Jiucer, refiding in that neighbourhood, to Dr. J. Greenway, near 
Peterfburg, in Virginia. 
XXIX. An Account of a poifonous plant, growing fpontaneoully in the 
fuuthern part of Virginia. Extraéted {rom a paper, communicated 
by Dr. James Greenway, of Dinwiddie-County, in Virginia. 
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222 
226 
234 
XXX. Defcription 
