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Letter 7524

Darwin, C. R. to Tyndall, John

1 Mar [1871]

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    Ogle will keep JT's suggestion in mind in observing less hairy races of man and the lower animals.

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    Asks JT whether he can help Ogle on a troublesome point on the colour of tissues with olfactory nerves, and the relation of colour to the absorption of odours. Does JT's respirator deprive odorous substances of their smell?


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