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0tological ability acoustic adult afferent American amount of hearing amplifying Anthropology and Psychology apparatus audiogram audiometer auditory auricular training CHAIRMAN committee conference congenitally deaf considerable cooperation day school deaf child deaf children deafened persons discussion Division of Anthropology doaf F0RRESTER Federation feel fingers FLETCHER Forrester frequencies fundamental Gault give Goldstein grade graduation GUILD hard of hearing Harvey Fletcher havo hearing child hearing sense hoar important improvement individual Institute instruction instrument intelligence intensity interest investigation Knight Dunlap laboratory language lip-reading lips means measure mechanism ment mental methods Miss monochord National Research Council nerve normal hearing organs otologists otology otosclerosis Pintner pitch possible present problems pupils question rosults sounds speak stimulation suggested survey talk teachers temporal bones tests thing tho deaf thoy tones understand vagus nerves voice vowels words