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Letter 7518

Darwin, C. R. to Tyndall, John

[27 Feb 1871]

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    Thinks JT's discovery of a glycerine respirator is an interesting practical discovery. CD has been wondering about the hairs in our nostrils, but doubts that JT has explained their function, since there are hardly enough.

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    Will ask W. Ogle to observe hairs in nostrils of different races.

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