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Has studied Variation with interest.
Cannot quite follow CD on reversion and Pangenesis,
but is amazed at CD’s observations and method.
Comments on varieties of asses, kidney beans, and artichokes.
Is not surprised that GB cannot digest Pangenesis, but it has been an immense relief to CD in tying together large classes of facts.
Sends names of men writing on crossing of plants. Criticises some French observations. Praises Hildebrand and Federico Delpino.
Sends pamphlets.
CD is experimenting on a large scale on difference in plants raised from self-fertilised and crossed seeds.
F. Hildebrand has produced a graft-hybrid which seems to lend important support to Pangenesis.
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Discusses Hildebrand
and criticises Delpino.
Asks to borrow C. K. Sprengel’s Entdeckte Geheimniss der Natur [1793].
Botanists have no explanation of the case of Viola odorata and other showy flowers being sterile while inconspicuous ones bear seed.
Sends Ernst Haeckel’s [Generelle] Morphologie [1866] and C. K. Sprengel’s book [Entdeckte Geheimniss der Natur (1793)].
A. Gaudry and L. Rütimeyer have declared in favour of CD’s views.
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Expresses thanks and pleasure at what GB has said about his book [Variation] in GB’s [Presidential] Address [to the Linnean Society, 1868, Proc. Linn. Soc. Lond. (1868): lvii–c]. "What you say about Pangenesis quite satisfies me".
CD discussed "bud-variation" to show that it was an error to believe all variability is due to sexual generation.