A 



JOURNAL 



OF 



NATURAL PHILOSOPHY, 

 CHEMISTRY, 



AND 



THE ARTS. 



VOL. XV. 



fdustratelr toitl) Cngralnnss* 



BY WILLIAM NICHOLSON, 



LONDON: 



PRINTED BY D. N. SUURY, BERWICK STR«tT, SOHOJ FOR 



THE AUTHOR, 



SOLD BY Ixl^ AT NO. 10, SOUO SQUARE; 



J. STRATFORD, 112, IIOT.BORN HILL ; AND 11. D. SYMONDS, 

 PATERNOSTER-ROW, 



180G, 



<^ 



