( 366 ) APPENDIX V.

ANALYSIS OF IRON ORE BY DR. RICHARD CASPARI.

{Translation.']

A. Ieon Oke feom 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.

h. Quartz.

c. Combined silicic acid.

d. Phosphoric acid.

e. Argillaceous earth.

/. Arsenic in very slight 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. Estimation of the insoluhle parts and of the Silicic Acid.

4-499 grm. of ore dissolved in faming 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 %