Effect of Foreign Metals on the Rolling of Zinc. E. PROST and A. VAN DE CASTEELE. (BuI'I. Soc. Chim. Belg. , xxvii, I75.)--Ingots weighing 40 pounds were prepared by casting together zinc alloys of various metals, with spelter containing lead I.O5 to 1.25, cadmium 0.076 to o.II, and iron 0.03 to 0.039 per cent. The conclusions are: Cadmium is harmful above 0.25 per cent.; with o.5 per cent. rolling is impossible. Arsenic: 0.02 per cent. markedly increases the hardness, and with 0.03 per cent. the metal is too brittle for practical purposes. Antimony is less objectionable than arsenic as regards hardness, as 0.07 per cent. does not increase the hardness ; but 0.02 per cent. is enough to produce a striated surface on the rolled sheet, which makes it unsalable. Tin is objectionable when above o.oi, and prohibitive at 0.03 per cent. Copper has no hardening effect until it reaches 0.08, and with o.19 per cent. the zinc is unworkable. Iron: o.12 per cent. is a permissible maximum, but this is easily reduced in refining. Lead: Though I to 1.25 per cent. does not interfere with the rolling, a slight increase not only seriously affects malleability, but the excess of lead remains unalloyed and forms patches on the sheet. The presence of two or more impurities together results in a combination of the injurious effects of each.