From:
Joseph Dalton Hooker
To:
Charles Robert Darwin
Date:
[16? Oct 1864]
Source of text:
DAR 101: 246, 246a
Summary:
Morphological differences only partly define species; physiological differences, e.g., incompatibility results in Primula, are far more interesting.
T. Thomson’s review of Agardh’s muddled book ["Agardh’s classification of plants", Nat. Hist. Rev. (1864): 536–51].
Contributor:
Darwin Correspondence Project
