1918 THE DURATION OF LIFE AND CONDITIONS ASSOCIATED WITH LONGEVITY A Tlii:; HYDE GENEALOGYSTUDY OF ALEXANDER GRAHAM BELL LIBRARY G The Duration of Life and Conditions Associated with Longevity A theStudy of Hyde Genealogy BY ALEXANDER GRAHAM BELL D. C.WASHINGTON, PUBLISHED BY THE GENEALOGICAL RECORD OFFICE 1601 THIRTY-FIFTH STREET 1918 LiERARf G D. C.WASHINGTON, INC.OF &PRESS JUDD DETWEII.