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4> One ounce of platina and eight of tin, drops into afluid mixture of black flux and common salt, united, 'with-out loss, into a pretty tough compound; which bore to beconsiderably flattened under the hammer without break-ing, cut smooth with a thin chisel, and shaved with aknife. Broken, it appeared of a sparkling, dark coloured,’coarse grained texture.

5. One part of platina and twelve of tin, treated in thelame manner, formed a mixture tolerably ductile $ but stillof a dull dark hue, and a rough coarse grain, though lessso than the preceding.

6. A mixture of one part of platina and twenty-four oftin, stretched under the hammer almost as easily as tin it-self, but broke much sooner on bending. The colour waswhiter, and the grain finer and evener, than those of thepreceding compositions, though in both respects it fellconsiderably short of pure tin.

7. Several of these compositions, covered with blackflux which had been previously melted by itself, till itceased to boil up, were exposed, in crucibles closely luted,to a strong fire in a wind furnace, which was steadily keptup for eight hours. When taken out, they were all foundto have suffered some diminution of weight, amounting toabout one fortieth part of the tin. In their appearanceand quality, there did not seem to be any alteration, exceptthat the grain was a little finer, and the texture rathermore uniform.

The foregoing mixtures seem to include a sufficient la-titude, in the proportions of the two metals, for discover-ing their general effects on one another. We may inferfrom them, that within this latitude, platina diminishesthe malleability of tin, renders its texture coarser, and de-bases its colour, more or less according as the platina is ingreater or less proportions and that, when the platina.

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