CONTENTS. 



Page 

 Art. I. On Isomeric Transmutation, and the Views 

 recently published concerning the compound 

 nature of Carbon, Silicon, and Nitrogen. 

 By George Wilson, M.D., Lecturer on 

 Chemistry, Edinburgh. Communicated by 

 the Author, . . . .1 



II. On the Volume of the Niagara River, as de- 

 duced from Measurements made in 184 L 

 By Mr E. R. Blackwell ; and calculated 

 by Z. Allen, . . , .21 



III. On a Carbonaceous Deposit, or Film, on the 

 Lakes of Westmoreland. By John Davy, 

 M.D., F.R.S., L. and E. Communicated 

 by the Author, . . . .27 



IV. Outlines of Mr W. Hopkin's Researches in 

 Physical Geology. 1st, 2d, and 3d Series. 

 (London, 1839-1842.) By Charles Mac- 

 LAREN, Esq., F.R.S.E. Communicated by 

 the Author, . . . .29 



V. On the Terrestrial Arrangements connected 

 with the Appearance of Man on the Earth : 

 being the substance of a Lecture delivered 

 by Professor Gustav Bischof of Bonn, at 

 Bonn, . . . . .44 



I. Coal and Soil, .... 44 



II. Saltpetre, ..... 52 



III. Water— its Effects, .... 53 



