From:
Charles Robert Darwin
To:
Joseph Dalton Hooker
Date:
11 [Dec 1854]
Source of text:
DAR 114: 148
Summary:
Debates aberrant species, e.g., Ornithorhynchus and Echidna, with JDH. CD argues they are result of extinction having removed intermediate links to allied forms.
Studying effects of disuse in wings of tame and wild ducks.
Tabulations showing that number of species in a genus is not correlated with number of genera in an order.
Contributor:
Darwin Correspondence Project
