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From J. L. H. Down   20 December 1873

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Summary

Describes an ear from a microcephalous idiot, which does not lend support to Ludwig Mayer’s view [that points on ears are mere variations; see Descent, 2d ed., pp. 15–16].

Is working on involution rather than evolution, with results confirming CD’s teaching.

Author:  John Langdon Haydon Down
Addressee:  Charles Robert Darwin
Date:  20 Dec 1873
Classmark:  DAR 87: 61–2
Letter no:  DCP-LETT-9188

From J. L. H. Down   18 December 1873

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Summary

Describes features of an ear of a microcephalous idiot, one of which contradicts Carl Vogt’s views [Mémoire sur les microcéphales (1867)].

Author:  John Langdon Haydon Down
Addressee:  Charles Robert Darwin
Date:  18 Dec 1873
Classmark:  DAR 87: 63–4
Letter no:  DCP-LETT-9191
Document type
letter (2)
Author
Addressee
Correspondent
Darwin, C. R.[X]
Down, J. L. H.[X]
Date
1873
12
18 (1)
20 (1)
letter