The synthetic experiments of Dr. Pearson furnish the following results applicable to the present argument:--The bronze relics submitted to analysis and comparison consisted--1. of a lituus, or musical wind-instrument, found in the river Witham, Lincolnshire, in 1768; 2. A spear-head of the common unperforated form, "made of cast metal, as appears from its rough surface, figure, texture, and grain.... It is open grained almost as copper, and porous, as if made of bad metal, of a blackish-brown or dark-grey colour;" 3. A sauce-pan, (Anglo-Roman patella,) also made of cast metal, open grained, impressed on the handle with a stamp, C. ARAT.; 4. A bronze scabbard, with a sword of iron within it, thought to be Danish; and, 5. Three celts, (Nos. 1 and 3, what we now term axe-heads, No. 2 an axe-shaped palstave,) all found in the bed of the river Witham. In his comparative experiments Dr. Pearson fused fifty grains of tin with 1000 grains of copper; _i.e._, one part of tin to twenty parts of copper. The result, when polished, differed in shade of colour from that of the celt metals, being much darker--a point not unworthy of note in determining some of the characteristics of primitive bronze relics. Its fracture shewed a colour inclining to the peculiar red of copper. One hundred grains of tin united by fusion with 1500 grains of copper; _i.e._, one part of the former to fifteen parts of the latter, resembled the celt metals, Nos. 1 and 2 in colour, polished surface, grain and brown colour of the fracture, the red of the copper being no longer apparent. It was stronger than the celt metals, but not so hard, while it was harder than the spear-head and the patella. No very remarkable differences are observable in the experiments of the combinations of twelve, ten, nine, and eight parts of copper with one of tin. When, however, the copper is reduced to seven parts to one of tin, the increase in hardness and brittleness becomes very apparent, while the alloy is decidedly paler in colour. The same characteristics were still more marked on successively reducing the proportions of copper to seven, six, five, four, and three; and when an alloy was made of two parts of copper with one part of tin, it "was as brittle almost as glass." It is not difficult, from these results, to imagine the process pursued by the old worker in bronze, who, having ascertained that he could harden his copper by alloying it with tin, would not fail to diminish the added quantities of the latter till he had secured an efficient practical admixture for the purposes of his manufacture, in which it is apparent, from the above results, that no very great nicety of apportionment of the ingredients was required. The most fit proportions for the manufacture of weapons and tools Dr. Pearson considers to be one part of tin to nine parts of copper.