spit 
el x 
a Se * - at the Girard College, Philadelphia, between the years . 1840 
CONTENTS UF VOL URS 2a at, 
NUMBER XCI. 
Pag: 
Art. I. On the Optical Phenomena presented by the “ Silver- 
Spring,” in Marion oe ri m Prof. Joun Le- 
Il, On Nobert’s Test Plate ad the Stris of Disickie 3 by w. s. 
Sutiivant and T, G. Wormtey, - 
lif. On the Track of an Animal lately found in ihe Poudais 
Formation; by Sir W. E. Logan, F.R.S., . . - 
IV. Caricography ; by Prof. C. Dewey, - - 
V. bs motions of Fluids and Solids relative to the Barth's Sur. 
; by W. Ferre. - . : 
¥i Serenata Notices ; 5 D. C. om x. XV, - 
retic Explorations—The Hayes Eipedition, 51.— 
Fall's Search for the Relics of Franklin’s Expedi- 
tion, 54.—Capt. Parker Snow’s Proposal to Search 
for the Franklin Relics, 57.—Heuglin’s Search for 
Dr. Vogel in Central Africa, 59.—Medical Statistics 
of the U.S. Army : Squier’s Collection of Original 
Documents concerning the Discovery of America, 60. 
VII. Researches on the Platinum ree Py Prof. Wotcott 
Gisss, M.D., . 
VIII. On a Method of Gioia: bisreldeghe by ea: by 
Prof. O. N. Roop, (with an illustration,) 
IX. Note on Sources of Error in the Me iohnsnieds of Pietic 
Acid to detect the Presence of Potash; by M. Cargy Lea, 
X. On a Series of New Combinations of Ammonia, Picric Acid 
and Metallic Bases; by M. Carry Lea, 
XI. The Guernsey County (Ohio) Meteorites,—a ‘ini ac- 
count of the phenomena attending their fall, with a chemical _ ‘ 
analysis of them; by Prof. J. Lawrence Situ, M.D.,_— - 
= Abstract of a Discussion of the Influence of the Moon on the 
* Declination of the Magnetic Needle, from the observations 
ee 
and 1845; by A. D. Beene, Supt. Vs s..C Consens ies 
a PHapiniss 0 : - 
