{* sxxvi ); 
ed NG LB IN eee 
OF 
VOLUME Tl. 
N°. 
1 Con FECTURES concerning the formation of the Earth, 
toc. in a Letter from Dr. B. Franklin, zo the Abbe Soulavie. 
Il. Anew and curious Theory of Light and Heat ; in a Letter from 
Dr. B. Franklin ze David Rittenhoufe, E/g. 
Ul. Defeription of the proce/s to be obferved in making large fheets of 
paper inthe Chinefe manner, with one [maoth furface. Communi- 
cated by Dr. B. Franklin. 
TV. Queries and Conjectures relative to Magneti/m, and the Theory of 
the Earth, in a Letter from Dr. B. Franklin to Mr. Bodoin. 
V. Explanation of a fingular phenomenon, firft obferved by Dr. 
Franklin, and not hitherto fatisfactorily accounted for. Ina Let~ 
ter from Mr. R. Patterfon, fo Dr. B. Ruth. 
VI. An Account of an Earthly Subftance found near the Falls of Nia- 
gara and vulgarly called the Spray of the Falls: together with fome 
vemarks on the Falls. By Robert M‘Cauflin, M. D. communi- 
cated by Benjamin Smith Barton, M. D. 
VII. Odfervations on the probabilities of the Duration of Human 
Life, and the progrefs of Population, in the United States of Ame- 
rica ; ina Letter from William Barton, Efg. to David Ritten- 
houfe, L. L. D. Prefident A. P.S. 
VII. Extra of a Letter from Andrew Ellicott to David Rit- 
tenhoufe, E/q. dated at Pittfburg, November 5th, 1787, contain- 
ing obfervations made at Lake-Erie, on that fingular phenomenon, 
by feamen termed looming. 
IX. 
Page 
190 
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