Letter 13542
Darwin, C. R. to Geddes, Patrick
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PG's article in Encyclopaedia Britannica wonderfully well done ["Insectivorous plants", 9th ed., 13: 134–40].
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Admires PG's researches on chlorophyll in animal kingdom ["Sur la chlorophylle animale", Arch. Zool. Exp. Gen. 8 (1880): 51–8].