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Hubrecht, A. A. W. in correspondent 
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From:
Charles Robert Darwin
To:
Ambrosius Arnold Willem Hubrecht
Date:
25 Aug 1879
Source of text:
Hubrecht Institute for Developmental Biology and Stem Research
Summary:

Thanks for essay. Doubts AAWH’s theory concerning modifications in first- and last-born offspring.

Contributor:
Darwin Correspondence Project
From:
Ambrosius Arnold Willem Hubrecht
To:
Charles Robert Darwin
Date:
2 Dec 1879
Source of text:
Hubrecht Institute for Developmental Biology and Stem Research
Summary:

Expresses his gratitude for CD’s criticism and advice relating to his unripe hypothesis [see 12200]. His new results regarding the anatomy of different genera of Nemerteans, especially the discovery of a central nervous system.

Contributor:
Darwin Correspondence Project