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To J. W. Clark   9 February 1875

Summary

Thanks for information about effect of fear on the iris.

Author:  Charles Robert Darwin
Addressee:  Joseph Warner Clark
Date:  9 Feb 1875
Classmark:  University of California, Berkeley, The Bancroft Library (BANC MSS 74/78 z)
Letter no:  DCP-LETT-9847

From J. W. Clark   25 June 1875

Summary

Observations of fear in animals marked by dilation of pupils.

Author:  Joseph Warner Clark
Addressee:  Charles Robert Darwin
Date:  25 June 1875
Classmark:  DAR 161: 154
Letter no:  DCP-LETT-10030

From J. W. Clark   16 September 1875

Summary

Examples of pupillary dilation.

Author:  Joseph Warner Clark
Addressee:  Charles Robert Darwin
Date:  16 Sept 1875
Classmark:  DAR 161: 155
Letter no:  DCP-LETT-10158
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Clark, J. W. (b)disabled_by_default
Darwin, C. R.disabled_by_default