6. _Gold with nickel._ Mr. Hatchett fused 11 parts gold and 1 nickel together, and obtained a brittle alloy of the colour of fine brass. 7. _Gold with tin._ Gold combines with tin and forms a brittle alloy. 10 parts gold and 1 tin form a pale alloy and less ductile than gold. One fiftieth of tin does not materially injure the ductility. Heat, up to a visible red, does not impair the alloy; but beyond that the tin fuses and the alloy falls to pieces. _Hatchett._ 8. _Gold with lead._ The effect of uniting even a very small proportion of lead to gold is remarkable. When the alloy contains ¹/₂₀₀₀ part of lead, it is brittle like glass. The vapour of fused lead in close vessels is sufficient to injure gold. _ibid._ 9. _Gold and zinc._ These two metals combine in almost any proportion. When 11 parts gold and 1 zinc are alloyed, the compound is of a pale greenish yellow like brass, and very brittle. Equal parts of these metals form a very hard, white alloy, susceptible of a fine polish. _ibid._ & _Hellot._ 10. _Gold and bismuth._ Gold unites with bismuth, but the colour is injured and the ductility of the alloy destroyed by a very small portion of the latter metal, the same as with lead. _ibid._ 11. _Gold and antimony._ These metals combine and produce a brittle alloy, much of the same kind as those with bismuth and lead. _ibid._ 12. _Gold and arsenic._ There seems a considerable affinity between gold and arsenic, but the volatility of arsenic in the fusing temperature of gold renders it difficult to bring them into contact. A very small proportion of arsenic makes the alloy brittle, and this property increases with the arsenic. _Hatchett._ 13. _Gold with cobalt._ These unite and form a brittle alloy, even when the cobalt only makes ¹/₆₀ of the compound. _ibid._ 14. _Gold and manganese._ Gold and manganese may be united, and the alloy is very hard and less fusible than gold. One alloy was found to consist of 7 or 8 parts of gold and 1 of manganese. _ibid._ _Alloys of Platina with other Metals._ 1. _Platina and silver._ It does not appear very clear that these two metals combine by fusion; at least if they do, the difference in their specific gravities is sufficient to overcome their affinity. 2. _Platina and mercury._ See amalgams. 3. _Platina and copper._ These two metals unite with difficulty by a strong heat and form a malleable alloy. This alloy has been preferred for specula for telescopes, as it is hard, polishes well, and is not liable to tarnish. _Lewis._ 4. _Platina and iron._ Platina and soft or pure iron do not seem to be easily combined by heat, by reason of the infusibility of iron. But it combines with cast iron and steel by heat. The alloy is very hard, and in some decree ductile when the iron forms ¾ of the alloy. _ibid._