CONTENTS. XXV 



VII. An Account of fome Experiments to determine the Force of fired Gun- 

 powder. By Benjamin Count of Rumford, F.R.S. M.R.I.A. (concluded from 

 p. 468) — _ __ — p. 515 



Why fire-arms do not burft; by the extreme force of gunpowder. Much of the gunpowder i> blown 

 out of fire-arm3 unburned. This was probably on fire, but extinguifhed by rapid motion through 

 the air. Direft experiments by firing gunpowder againft a number of paper fcreeni. Remediet 

 for the flow combullion of gun-powder. Windage, Probability that the force of gunpowder ii 

 owing to fleam. 



VIII. Obfervations on Scrontian. By Citizen Pelletier. Read^to the National 

 Inftitute, April 30, 1796 — — — p. 15' 



Difcovery of ftrontian. Klaproth's account of the diftinfiive charafter of carbonate of (Irontian. 

 Comparifon of ftrontian and barytes. Procefs for feparating the carbonic acid from the carbonate! 

 of barytes and ftrontian. Habitudes of the carbonates of barytes and ftrontian. 



IX. Philofophical News, and Accounts of Books — — P* 523 

 Garncrin's defcentby a parachute from an elevation of 600 feet. Theory of the parachute. ^ 



MARCH 



