Singular effects in nature depending on sound--Permanent
character of speech--Influence of great elevations on the
character of sounds, and on the powers of speech--Power
of sound in throwing down buildings--Dog killed
by sound--Sounds greatly changed under particular circumstances--Great
audibility of sounds during the night
explained--Sounds deadened in media of different
densities--Illustrated in the case of a glass of champagne--and
in that of new-fallen snow--Remarkable echoes--Reverberations
of thunder--Subterranean noises--Remarkable
one at the Solfaterra--Echo at the Menai suspension
bridge--Temporary deafness produced in diving-bells--Inaudibility
of particular sounds to particular ears--Vocal
powers of the statue of Memnon--Sounds in
granite rocks--Musical mountain of El-Nakous 212