WHISTLES FOR AUDIBILITY OF SHRILL NOTES

From Inquiries into Human Faculty and Its Development by Francis Galton.

(See also Appendix, p. 252).--Construction of them; loss of power of hearing high notes as age advances; trials upon animals; sensitivity of cats to high notes; of small dogs and ponies.

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WHISTLES FOR AUDIBILITY OF SHRILL NOTES: Inquiries into Human Faculty and Its Development by Francis Galton | amphi