From:
Charles Robert Darwin
To:
Thomas Davidson
Date:
23 Dec [1856]
Source of text:
American Philosophical Society (Mss.B.D25.142)
Summary:
Asks TD about variation among brachiopods.
Contributor:
Darwin Correspondence Project
Showing 1–2 of 2 items
Asks TD about variation among brachiopods.
His experience confirms CD’s view that some species and even some genera of Brachiopoda are consistently more variable than others, and that such variable forms are variable in all localities and at all periods. Similarly a species that shows a lack of variability does so at all points in time and space. Discusses the causes of variability. [See Natural selection, p. 106.]