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To Henry Denny   20 January [1844]


Discusses sending HD lice specimens. Asks him to check with G. R. Waterhouse.

Author:  Charles Robert Darwin
Addressee:  Henry Denny
Date:  20 Jan [1844]
Classmark:  American Philosophical Society (Mss.B.D25.37)
Letter no:  DCP-LETT-731

To Henry Denny   5 February [1844]


Dicussion of some specimens from the Beagle voyage.

Author:  Charles Robert Darwin
Addressee:  Henry Denny
Date:  5 Feb [1844]
Classmark:  Jeremy and Helen Evans (private collection)
Letter no:  DCP-LETT-734F

To Henry Denny   1 June [1844]


Sends HD a reference to human lice from Charles White 1799.

Author:  Charles Robert Darwin
Addressee:  Henry Denny
Date:  1 June [1844]
Classmark:  19th Century Shop (dealers) (April 2016)
Letter no:  DCP-LETT-754F

To Henry Denny   3 June [1844]


Discusses intestinal worms among humans.

Comments on origin of human races.

Author:  Charles Robert Darwin
Addressee:  Henry Denny
Date:  3 June [1844]
Classmark:  American Philosophical Society (Mss.B.D25.35)
Letter no:  DCP-LETT-755

To Henry Denny   [27 July – 10 August 1844]


Sends four packets of lice and suggests writing to Dr A. Smith, "the S. African traveller", for assistance.

Author:  Charles Robert Darwin
Addressee:  Henry Denny
Date:  [27 July – 10 Aug 1844]
Classmark:  Yale University Medical Historical Library, Harvey Cushing / John Hay Whitney Medical Library (MMS)
Letter no:  DCP-LETT-763F

To Henry Denny   12 August [1844]


Can hardly believe he made a mistake in specimens sent to HD. Recopies numbers in case he transposed them. [Has to do with lice taken from a specimen of aperea and put into spirits during Beagle voyage.]

Author:  Charles Robert Darwin
Addressee:  Henry Denny
Date:  12 Aug [1844]
Classmark:  American Philosophical Society (Mss.B.D25.)
Letter no:  DCP-LETT-770

From Henry Denny   30 October 1844



Has never heard of species of same genus [of parasites] being found on both birds and mammals, or different genera and species being found on animals in the domestic and wild states. Implications of this for relationship of aperea and guinea-pig.

Author:  Henry Denny
Addressee:  Charles Robert Darwin
Date:  30 Oct 1844
Classmark:  DAR 205.3: 273
Letter no:  DCP-LETT-785

To Henry Denny   7 November [1844]


Discusses HD’s information that same species of birds at remote stations have identical parasites. Urges him to investigate N. American land-bird parasites.

Is deeply interested in everything connected with geographical distribution, and the differences between species and varieties.

Author:  Charles Robert Darwin
Addressee:  Henry Denny
Date:  7 Nov [1844]
Classmark:  Cleveland Health Sciences Library (Robert M. Stecher collection)
Letter no:  DCP-LETT-787
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