From:
Charles Robert Darwin
To:
Henry Johnson
Date:
2 May [1872]
Source of text:
Torquay Museum Society (AR470)
Summary:
Thanks for notes on worm-castings. Amount of ammonia surprises CD. David Forbes asserts that published analysis of carbon in vegetable matter valueless. Suspects that worms search for food and do not blindly swallow earth.
Contributor:
Darwin Correspondence Project