From:
Charles Robert Darwin
To:
John Edward Gray
Date:
1 July [1856]
Source of text:
Natural History Museum, Library and Archives (General Special Collections MSS DAR 69)
Summary:
Requests information on ranges of echinoderms for his essay on variation [Natural selection]. Are there genera with representative species in northern and southern seas, but none in tropics?
Contributor:
Darwin Correspondence Project