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From:
Charles Robert Darwin
To:
George John Romanes
Date:
[15 June 1876 or later]
Source of text:
American Philosophical Society (Mss.B.D25.495)
Summary:

Describes discovery by his son [Francis Darwin] of protoplasmic filaments extending from small glands in the leaves of Dipsacus [see Proc. R. Soc. Lond. 26 (1877): 4–8].

Contributor:
Darwin Correspondence Project