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20 per cent affected Aids to hearing audiometer Audiometric tests audiphone audition auditory nerves Baby crying Birds singing Cat mewing caus Cause of Deafness cent of Hearing centage children class classification comprehend Congenital cylinder Deaf Mutes defective hearing degree of hear disc diseases ditory Dog bark E.—Bird education exercises designed experiments fact Garey going to prove graduated bar graphophone gree of hearing H.—Whistle heard hearing power Illinois Institution inquiring mind instrument intelligence JACKSONVILLE L.—Music left ear M.—Whistle means ment modicum of hearing Music noise Normal hearing Number Tested partially deaf percentage of hearing perception person born phonograph physical Pig squealing possessed practical Prof pupils in institutions receive instruction recitation record of various record of zero Rhodes right ear sation semi-deaf sistant sixty pupils sound sound-impression stitution success sult Supposed Cause teacher tion total deaf treatment tubes Unknown Unknown utilize various degrees vibrometer vocal speech Whistle whole number words