APPENDIX 
Examination of the Iron forged by the Negroes of Fhida Diallon, 
in Upper Senegal, and of the Ores from which they procure it. 
By M. BERTHIER, 
Engineer of Music, and Professor at the Royal School of Mines. 
The specimens of iron and ore which have been examined, "were 
brought from Senegal by M. Mollien, who picked them up himself 
on the spot, and were sent to the laboratory of the Royal School 
of Mines by M. Brongniart. 
There were two specimens of iron ; one, rudely hammered, 
appeared to have been taken from a mass, and the other was drawn 
out into a flatted bar, some centimetres (each ,39371 inch, English) 
broad, and some millimetres (each ,03937 inch, English) thick. 
The fragment of the mass was very porous, and full of cracks, 
nevertheless, very tenacious ; it was not without difficulty that a 
piece of five grammes (15,4440 grains English each) could be 
