( 366 ) APPENDIX y.

ANALYSIS OF .IRON ORE BY DR. RICHARD CASPARI.

[Translation.']

A. Iron Ore from Madi, Central Africa. No. 1, found by Robert W. Felkin, September 1879.

The sample of ore submitted to me was a dark reddish-brown mass. Qualitative analysis proved the presence of the following constituents : a. Oxide of iron, of which it principally consisted.

&. Quartz.

c. Combined silicic acid.

d. Phosphoric acid.

e. Argillaceous earth.

/. Arsenic in very shght traces.

g. Water and distinct traces of vegetable matter.

1. Estimation of the Water.

8-1085 grm. of the ore finely powdered, dried at 110° C. until it ceased to lose weight, lost 0*2465 grm. of water, or 3*04% Heated to red heat until the weight became constant, there was a further loss of 0'2375 grm., or ., .. 2*929 % 2. Estiraation of the insoluble parts and of the Silicic Acid.

4"499 grm. of ore dissolved in fuming hydi-ochloric acid, the solution evaporated down to a dry mass ; the quartz and silicic acid removed gave a residue of 1-0450 grm., or 23-227%