PROCEEDINGS OF THE 



AMERICAN PHILOSOPHICAL SOCIETY. 

 HELD AT PHILADELPHIA, FOR PROMOTING USEFUL KNOWLEDGE. 



VOL. IX. !N'o. 72. 



CONTENTS. 



July 15, 1864. page 



On County Maps By W. L. Nicholson 403 



On Daily Aerial Tides, By P. E. Chase 405 



August 19, 1864. 

 On Pfahlbauten in Bavaria ....... . 413 



September 16, 1864. 



On Prime Right-angled Triangle.^. By .J. Lbwis .... 415 

 On the Comparative Fitness of Language.s ibr Musical Expression. 



By P. E. Chase 419 



On Certain Primitive Names of God. By P. E. Chase . . . 420 



October 7, 1864. 

 Magellanic Premium. By "Torricelli" 425 



October 21, 1864. 



On Terrestrial Magnetism. By P. E. Chase 427 



November 18, 1864. 



Obituary Notice of Prof. Hitchcock. By Dr. Goodwin . . . 443 

 On Crude Borax of California. By Dr. Harris .... 450 

 On Soundings in the Delaware Gap. By F. Peale . . .451 



December 2, 1864. 



On the Twenty-inch Gun. By C. Knap . 



On Dew and Hoarfrost. By Sig. Zantedeschi 



On Magnesium. By Mr. Dubois .... 



On Nova Scotia Coal. By W. A. Hendry 



On an Old Salt Well in Pennsylvania. By J. M. Hale 



On Fragments of Ancient Pottery. By F. Peale . 



December 16, 1864. 



454 



456 

 458 

 459 

 459 

 460 



On the Late Discovery of Lignite in Middle Penn.sylvauia, and on 



the Erosion of the New Red. By J. P. Lesley . . . 463 

 On Photo-lithography. By Mr. Osborne 483 



