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From A. R. Wallace   1 March 1868

Summary

Offers enclosure demonstrating that natural selection could produce sterility of hybrids.

More on Pangenesis and the inadequacy of H. Spencer’s approach.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  1 Mar 1868
Classmark:  DAR 106: B49–50, B53–5
Letter no:  DCP-LETT-5966

From A. R. Wallace   8 March [1868]

Summary

On critical exchanges at the Linnean Society on natural selection and mimicry.

Roland Trimen’s paper on South African mimetic butterflies ["On some remarkable mimetic resemblances among African butterflies", Trans. Linn. Soc. Lond. 26 (1870): 497–523; read 5 Mar 1868].

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  8 Mar [1868]
Classmark:  DAR 106: B51–2
Letter no:  DCP-LETT-5996

From A. R. Wallace   15 March [1868]

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Summary

Coloration of butterflies; brilliantly coloured females.

Commends CD on his paper on specific differences in Primula [J. Proc. Linn. Soc. Lond. (Bot.) 10 (1869): 437–54; reprinted and revised in Forms of flowers] as a test-case proving origin of real species.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  15 Mar [1868]
Classmark:  DAR 82: 23–4
Letter no:  DCP-LETT-6012

To A. R. Wallace   17 [March 1868]

Summary

On his Primula paper for the Linnean Society ["On the specific difference between Primula veris, Brit. Fl. (var. officialis, Linn.), P. vulgaris, Brit. Fl. var. acaulis, Linn.), and P. elatior, Jacq.; and on the hybrid nature of the common oxlip; with supplementary remarks on naturally produced hybrids of the genus Verbascum", [officinalis!?] J. Linn. Soc. Lond. (Bot.) 10 (1869): 437–54].

Peacocks and sexual selection.

ARW’s sterility argument has driven CD’s sons half-mad.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  17 [Mar 1868]
Classmark:  The British Library (Add MS 43434: 115–17)
Letter no:  DCP-LETT-6018

From A. R. Wallace   19 March 1868

Summary

On sterility of natural species and natural selection. Closely allied forms from adjacent islands offer best chance of finding good species fertile inter se.

Problem of minute variations and sexual selection.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  19 Mar 1868
Classmark:  DAR 106: B59–60
Letter no:  DCP-LETT-6024

To A. R. Wallace   [21 March 1868]

Summary

On problem of sterility, CD cannot persuade himself that it has been gained by natural selection.

On sexual selection and minute variations, he tends to agree with ARW. Sends George Darwin’s notes on ARW’s argument.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  [21 Mar 1868]
Classmark:  The British Library (Add MS 46434: 119–20); DAR 106: B160–3
Letter no:  DCP-LETT-6033

From A. R. Wallace   24 March [1868]

Summary

Returns George Darwin’s criticisms of his notes on sterility and sends further notes in reply. Since there are degrees of sterility between varieties, "is it not probable that natural selection can accumulate these variations?" Varieties that are adapted to new conditions could then survive and form new species without being isolated.

Author:  Alfred Russel Wallace
Addressee:  Charles Robert Darwin
Date:  24 Mar [1868]
Classmark:  DAR 106: B61–2, B158–9
Letter no:  DCP-LETT-6045

To A. R. Wallace   27 March [1868]

Summary

There are so many doubtful points on the problems relating to sterility that they will never agree.

Author:  Charles Robert Darwin
Addressee:  Alfred Russel Wallace
Date:  27 Mar [1868]
Classmark:  The British Library (Add MS 46434: 123–4)
Letter no:  DCP-LETT-6058
Document type
letter (8)
Addressee
Correspondent
Darwin, C. R. (8)
Wallace, A. R.[X]
Date
1868
03
01 (1)
08 (1)
15 (1)
17 (1)
19 (1)
21 (1)
24 (1)
27 (1)
letter