Showing 41–60 of 82 items
On proportion of sexes [of moths?] raised from larvae: AW does not select largest exclusively.
Account of lambing in 1864 after unusual drought.
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.
Thanks for Variation.
Sexual selection of pigeons, ducks;
polygamous birds.
Some questions on errata in second English issue of Variation.
Sends a paper by Robert Hartmann on domestic animals of the countries bordering the Nile ["Geographische Verbreitung der im nordöstlichen Afrika wild lebenden Säugethiere" Z. Ges. Erdkd. Berlin 3 (1868): 28–69, 232–70, 345–68, 404–20].
Has thought much about CD’s theory of Pangenesis. It "seems rather a little too complicated … as a molecular theory".
Proportions of male and female lambs.
Will start translating Für Darwin. Suggests it be called "A Lift for Darwin".
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.
Sends papers.
Writes of his son’s affairs.
Is reading Variation and discusses a point relating to feeding habits of horses.
Reports her sister-in-law’s observations of her child, up to three months old, while crying and screaming.
Asks for CD’s "candid criticisms" of his paper [on Variation].
On attraction of males by females in moths. H. T. Stainton mentions a case.
Asks CD to breakfast in London on Tuesday [24 Mar].
Suggests possible arbitrators to act in a business transaction involving WED.
Has received English edition of Variation. First volume of German edition came three months ago. Comments on book.
Will send copy of recent lectures on human evolution [Entstehung des Menschengeschlechts (1868)]. Gegenbaur much interested in the subject.
Considers Selachius the ancestral form of the fish and hence of all higher vertebrates. Believes their swim-bladder became lung of amphibians.
Mentions cases of hybrid crosses between rabbits and hares producing fertile offspring.
Relates a variety of facts about sexual selection in birds. [See Descent 2: 104–5.]
CD relays the advice of Sir W. R. Grove on the dismal prospects of a law career.
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.
Experiments to test Wallace’s theory that brightly coloured caterpillars are rejected by birds. [See Descent 1: 417.]
