C O N T E N T S. 



Pa<;e 



Akt. I. Biographical Memoir of Edward Turner, M. D., 

 F.R.S. L. &E., Professor of Chemistry in the 

 University of London, &c. By Robert Christi- 

 SON, M. D., F. R. S. E. Professor of Materia Medica 

 in the University of Edinburgh, &c. - - 227 



I J. Analysis of the Scales of the Fossil Gavial of Caen 

 in Normandy. By A. Connell, Esq. F. R. S.E. 

 &c. Communicated by the Author, - 252 



III. On the Chemical Composition of Clay-Slate. By 



Hermann Frick, - - " -^^ 



Analysis of Clay-slate, by separation into its compo- 

 nent portions (Gemengtheile), - - 257 

 Analysis of Clay.slate considered as a whole, - 259 

 Analysis of the component portions of Clay-slate, - 259 



IV. Annual Report on the State of the Useful Arts, 



ordered by the Society of Arts for Scotland. By 

 Edward Sang, Esq. F. R. S.E. Vice- Pres. Soc. 

 Arts. Communicated by the Society of Arts, 262 



On the Progress of Exactitude in the Manufacture of 



Machines, - - ' " 20- 



V. Thermometric Tables ; Barometric Tables ; Tables 

 of Toises, French Feet and Inches, Metres and 

 Millimetres ; Tables of English Feet and Inches. 

 By George Atken, Esq. Communicated by the 

 Author, 281 



