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acid airplane Ameri American ancient animals appear article is automatically Association astronomers atoms August 11 Biology birds body cents a copy chemical Chemistry chemists Chicago City coal color December December 22 developed disc disease earth Editor eggs electric engine experiments feet fever film Frank Thone geyser glass heat human inches Indian industry insects Institute July July 28 kilocycles known Laboratory Leica light living magnetic measure Medical ment mental method miles modern moon National nature News-Letter November Observatory October October 20 photographs Physics picture plants present produced Prof radio radiovision rays scarlet fever Science Newt-Letter Science Service scientific scientists September South species stars telescope temperature tests theory tion tree ture Turn U. S. Patent Office University Vernon Kellogg Washington waves WISTAR INSTITUTE wood words yellow fever York