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Tyndall, John in correspondent 
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From:
Charles Robert Darwin
To:
John Tyndall
Date:
4 Dec [1878]
Source of text:
DAR 261.8: 27 (EH 88205965)
Summary:

Has observed, perhaps erroneously, that certain plants were excited to movement by a prolonged high note on the bassoon. Would now like to try a siren and asks JT to bring one from the Royal Institution.

Contributor:
Darwin Correspondence Project