..."Schweinfurth, Von Luschan, Boaz, and others incline to thebelief that the Negroes invented the smelting of iron and passed iton to the Egyptians and to modern Europe...
W.E.B. Du Bois 「The Negro」
...Boaz says, "It seems likely that at a time when the European wasstill satisfied with rude stone tools, the African had invented oradopted the art of smelting iron...
W.E.B. Du Bois 「The Negro」
...Heaps ofiron-slag and furnaces for smelting iron were discovered, and there weremagnificent quays and landing places on the river side, for the export ofiron...
Various 「The Journal of Negro History, Vol. I. Jan. 1916」
...A large fume of what bore many marks of arsenic arose from the crucible during the time of smelting it...
David Collins 「An Account of the English Colony in New South Wales, Vol. 2」
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