From:
Charles Robert Darwin
To:
George Robert Waterhouse
Date:
[31 July 1843]
Source of text:
DAR 185: 69
Summary:
Has no objection to uniting Monotremata and other marsupials but would object to doing so solely on ground that Monotremata consists of only two species. Members of a natural group need not share common character so long as they are linked with those which do. Believes that if every organism that ever lived were collected, a perfect series would be presented. What are reasons that unite Aptera and Diptera?
Contributor:
Darwin Correspondence Project
