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]
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 |
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 |
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 |