Op New Taker Me Th: So XXXVI 
x An Account of the Sugar Maple-Tree of the United States, and 
of the methods of obtaining Sugar from it, together with obfervati- 
ons upon the advantages both public and private of this Sugar. In 
a Letter to Thomas Jefferfon, E/y. Secretary of State to the United 
States, and one of the Vice Prefidents of the American Philofophical 
Society ; by Benjamin Ruth, M. D. Profeffar of the Infiitutes 
and of Clinical Medicine in the Univerfity of Pennfylvania. 
X. Memsir of Jonathan Williams, on the ufe of the Thermometer 
in difcovering Banks, Soundings, &S°c. 
XI. An Account of the moft effectual means of preventing the delete- 
rious confequences of the bite of the Crotalus Horridus, or Rattle- 
Saake. By Benjamin Smith Barton, M. D. . 
XII. Magnetic Obfervations, made at the Univerfity of Cambridge, 
( Maffachufetts) in the year 1785. By Dr. S. Williams. 
XU. Accurate determination of the right afcenfion and declination of 
Rh. Bootes, and the Pole Star: in a Letter Jjvom Mr. Andrew E]-— 
licott ¢o Mr. R. Patterfon. 
XIV. Account of feveral Houfes in Philadelphia, frruck with Light- 
ning, on Fune 7th, 17809. By Mr. David Rittenhoufe, and Dr. 
John Jones. 
XV. An Account of the effetts of a frroke of Lightning on a Foufe 
Surnifoed with two Canduétors,—in a Letter from Meffrs. David 
Rittenhoufe, and Francis Hopkinfon ; to Afr. R. Patterfon, 
XVI. Experiments and Obfervations on E vaporation in cold Air, b ry 
C. Wiftar, M. D. 
’ 
XVI. Pofifcript to Mr. Barton’s Letter, to Dr. Rittenhoufe, of the 
17th of March. 1791. 
XVII. Nez Notation of Mufic, in a Letter to Francis Hopkinfon, 
fy. by Mr. R. Patterfon. 
Page 
64 
82 
Too 
Tig 
116 
TI9 
125 
134 
139 
XVUI. Obfervations on the Theory of Water Mills, &5°c. by W. Waring, 144 
XIX, 
