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Leaf (WALTER an English English)

WALTER, an English English scholar; born in 1852. After a brilliant career at Cambridge University, where he was Senior Classic, Chancellor's Medalist, and Fellow of Trinity, he entered mercantile life in 1877, retiring in 1892. A founder of London Chamber of Commerce, Chairman 1887; Pres. Hellenic Society 1914, and member of War Finance Committee same year. Litt.D. degrees from Oxin cubic or octahedral crystals; sp. ina. When the petiole is absent the leaf gr. 11.38. The lead of commerce is is said to be sessile. is often nearly pure and can be obtained perfectly so by reduction of the pure nitrate. Metallic lead, exposed to the action of air and pure water, is powerfully corroded, and as a result the water is found to have dissolved the oxide of lead.

The impurities of most waters modify this tendency by forming a thin film on the surface of the metal and so preventing any further oxidation. As a sanitary precaution, slate cisterns are greatly to be preferred to leaden ones. Lead enters into the composition of type-metal, pewter, Britannia metal, and plumbers' solder. The best tests for lead are hydric sulphide, which forms a black sulphide, and potassic chromate, which gives a yellow precipitate of lead chromate.