No.│ │Copper. │ Tin. │ Iron. 1.│Chisel from silver mines,│94· │6· │ │Cuzco, │ │ │ 2.│Chisel from Cuzco, │92·385 │7·615 │ 3.│Knife from grave, │97·87 │2·13 │ │Atacama, │ │ │ 4.│Knife ” ” │96· │4· │ 5.│Crowbar from Chili, │92·385 │7·615 │ 6.│Knife from Amaro, │95·664 │3·965 │0·371 7.│Perforated axe, │96· │4· │ 8.│Personal ornament, │95·440 │4·560 │ │Truigilla, │ │ │ 9.│Bodkin from female grave,│96·70 │3·30 │ │do., │ │ │ Nos. 1. Humboldt. 2. Dr. J. H. Gibbon. 3, 4. J. H. Blake, Esq. 5. Dr. T. C. Jackson. 6, 7. Dr. H. Croft. 8, 9. T. Ewbank, Esq. The comparison of this with the previous table indicates a smaller amount of tin in the American bronze than in that of ancient Europe. For some Egyptian spear-heads Gmelin gives, copper 77·60, tin 22·02; and the composition of ancient weapons, armour, vessels, and coins, seems to indicate such a systematic variation of proportions as implies the result of experience in adapting the alloy for the specific purpose in view. A much larger number of analyses would be desirable as data from which to generalise on the metallurgic skill developed independently by native American civilisation; but the examples adduced seem to show that there is no lost secret for Europe to discover.