APRIL 22 1899. Lightning Protection. German Steel Arch Bridges. Twelve-pounders Better than Six-pounders for the Maine. 'Maine' the Russian ship now building at Cramps The Telephone in the United States. Wireless Telegraphy. The Cancer Microbe. researches on the origin of cancer. 249 Science Notes. these wooden and iron pipes are unearthed., scientific american, 1899-04-22
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