CONTENTS. 
On the Ignition of Gunpowder by the Electric Discharge; and 
on the. Transmission of iis through Water, has By 
Mr. W. SturGron. . . os let te, YAS 
Notices respecting New Books . . - + 60,219, 289 
Proceedings of Learned Societies 67, 133, 221, 290, 373, 450 
Intelligence and Miscellaneous Articles 72, 148, 225, 301, 387, 
453 
List of New Patents: .'. . . « 75, 156, 231, 317, 388 
Meteorological Tables . . . « 80, 160, 240, 320, 392, 457 
PLATES. 
I. & II. Prof. Hanstren’s Paper on the Magnetic Poles of the Earth. 
IIf. Skeleton of the Plesiosaurus Dolichodeirus. 
ERRATUM: 
Page 301, line 5, for American read Amician. 
