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Letter 8965

Darwin, C. R. to Blackley, C. H.

5 July [1873]

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    Comments on CHB's book [Experimental researches on catarrhus aestivus – hay-fever or hay-asthma (1873)].

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    Explains that some pollens are wind-blown while others depend on insects for dispersal. Effect of pollen on skin and mucous membrane astonishing. Sends a book [M. Wyman, Autumnal catarrh (1872)].

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