[12] As they ascended the path, Tyndall's attention was
attracted by a shrill sound, which seemed to come from the ground at
his feet. Being a trained thinker he was at once curious to know what
was the cause of this. By looking carefully he found that it came from
a myriad of small insects which swarmed by the side of the path.
Having satisfied himself as to what it was he spoke to his companion
about the shrill tone and was surprised to learn that he could not
hear it. Tyndall's friend could hear all ordinary sound perfectly
well. This, however, seemed to be sound of such a character as did not
reach his sense of hearing. One who like Tyndall listened carefully to
sounds of all kinds would quickly detect anything uncommon. This
little incident teaches us that sounds may go on about us and yet we
know nothing of them. Also it teaches us to think about tones, seek
them, and in the first days increase our acquaintance and familiarity
with them.
Men of science, who study the different ways in which the mind works,
tell us that habit and also a busy mind frequently make us unconscious
of many things about us. Sometimes we have not noticed the clock
strike, although we have been in the room on the hour; or some one
speaks to us, and because we are thinking of something else we fail to
hear what is said to us. It certainly is true that very many people do
not hear half of the sounds that go on about them, sounds which, if
but heeded, would teach people a great deal.
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