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Darwin, C. R. in addressee 
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From:
John Thomas Riches
To:
Charles Robert Darwin
Date:
12 Nov 1877
Source of text:
DAR 176: 154
Summary:

Has studied the Comparettia falcata, not mentioned in Orchids, and found it is often self-fertilising.

Contributor:
Darwin Correspondence Project
From:
Reuben Aleshire Vance
To:
Charles Robert Darwin
Date:
12 Nov 1877
Source of text:
DAR 180: 1
Summary:

Writes of his observations on the "valves of Houston" in the rectum, which he believes to be rudimentary organs.

Contributor:
Darwin Correspondence Project