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Darwin, C. R. in correspondent 
Orton, James in correspondent 
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From:
Charles Robert Darwin
To:
James Orton
Date:
24 Feb [1870]
Source of text:
University of Oklahoma Libraries History of Science Collections
Summary:

Thanks JO for his The Andes and the Amazon.

Is sorry he has failed to get any information on the horse’s tooth.

Contributor:
Darwin Correspondence Project
From:
James Orton
To:
Charles Robert Darwin
Date:
31 Mar 1870
Source of text:
DAR 173: 39
Summary:

JO found fossil shells in the Amazon Valley, which discredits Agassiz’s claim of a glacial origin.

Would like Huxley’s opinion of the fossil horse’s tooth from Quito.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
James Orton
Date:
19 June 1876
Source of text:
Raab Collection (dealer) (November 2014)
Summary:

Obliged for the new edition of The Andes.

Contributor:
Darwin Correspondence Project