C) ONG AD ae IN AT g XXXIX 
UME 
KXX. Defcription ofa Machine for measuring a foip’s way: ina Let- 
ter from ¥rancis Hopkinfon, Ej. to Mr. Jghn Vaughan. 
XXX. An Inquiry into the Queftion, Whether the Apis Mellifica, 
or True-Honey-Bee, is a native of America. By Benjamin Smith 
Barton, M. D. 
XXX, da Account of a Comet, ina Letter to Jr. R. Patterfon, 
by David Rittenhoufe, Ey. 
XXXIUT. Cadmus, or a Treatife on the Elentents of Written Language, 
iluftrating, by a Philofephical Divifion of Speech, the Power of 
each Chara&er, thereby mutually fixing the Orthography and Orthoc- 
py. With en Effay on the mode of teaching the Surd, or Deaf and 
confequently Dumb, to Speak. By Wm. Thornton, M.D. 9 Hon- 
cred with the Magellanic Gold Medal, by the Philofophical Society, 
in December, 1792. 
XXXIV. Obfervations on the Theary of Water-Mills, (continued from 
page 193) by W. Waring. i 
XXXV. An Improvement on Metalic ConduGors or Lightning-rods ; 
iz a Letter to Dr. David Rittenhoufe, Prefident of the Society, 
Jrom Robert Patterfon of Philadelphia. Honored with the Magel- 
lanic Premium, by an Award of the Society in December 1 792. 
XXXVI. An eafy and expeditious method of difipatine the noxious Va- 
J & 
pour commonly found in Wells and other fudterraneous places ; by 
Ebenezer Robinfon, of Philadelphia. 
XXXVI. 4 method of draining Ponds in level grounds, by Jefle 
Higgins, of Delaware. 
XXXVI. Obfervations on the feverity of the winter, 1 779; 1780, 
by the Rev. Matthew Wilfon of Lewis, dated 22d Fune, 1780. 
XXXIX. 4 Defcription of a new Standard Sor Weights and Mea- 
fures; ina Letter from Mr. John Cooke, of Tipperary in Ireland, 
to Thomas Jefferfon. Efq. 
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XL. Deription 
