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Duncan, P. M. in addressee 
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From:
Charles Robert Darwin
To:
Peter Martin Duncan
Date:
18 July [1861]
Source of text:
American Philosophical Society (Mss.B.D25.257)
Summary:

He is no longer able to answer any of the correspondent’s questions concerning corals.

Places "much trust" in J. D. Dana.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Peter Martin Duncan
Date:
13 Apr [1868?]
Source of text:
American Philosophical Society (Mss.B.D25.272)
Summary:

Promises to send coral specimens.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Peter Martin Duncan
Date:
19 Sept 1876
Source of text:
American Philosophical Society (Mss.B.D25.498)
Summary:

Encloses coral specimen and manuscript account of it by William Lonsdale.

Contributor:
Darwin Correspondence Project