From:
Charles Robert Darwin
To:
William Bernhard Tegetmeier
Date:
20 July [1860]
Source of text:
Archives of the New York Botanical Garden (Charles Finney Cox Collection)
Summary:
Asks whether crossing breeds of hive-bees is advantageous
and whether different pigeon breeds have different incubation periods.
Explains and apologises for the lack of detailed quotations in Origin.
Contributor:
Darwin Correspondence Project