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From:
James Murphy
To:
Charles Robert Darwin
Date:
10 May 1876
Source of text:
DAR 171: 323
Summary:

A reader of Descent offers two items: 1. Masters observed a pericardial fold in humans and other mammals which is a vestigial left superior vena cava;

2. JM suggests the frenum of the human penis became necessary for vis-à-vis copulation when man became bipedal.

Contributor:
Darwin Correspondence Project