Showing 41–60 of 81 items
Sends data from J. G. Jeffreys on the form of shells of the sexes of Mollusca. [See Descent 1: 324, 326.]
Will gladly supply any information he can. Sends Registrar General’s reports; will inquire about the animals.
Proportion of sexes in spiders; coloration.
Has put question of proportion of sexes in insects to the Entomological Society. Quotes H. T. Stainton and F. Smith. Cites some cases mentioned by other members.
Is reading Variation; does not quite understand Pangenesis.
Discusses the flowers of, and cross- and self-fertilisation in, certain aquatic plants. Gives cases of dichogamy and perfect self-fertility.
Encloses letter (not found) from Australian friend responding to CD’s queries on expression.
Coloration of blind beetles.
Sizes of sexes in Taphroderes.
The Athenæum article [review of Variation, 15 Feb 1868, pp. 243–4] is a disgrace.
WSD will keep CD’s queries about Hemiptera in mind. Secondary sexual characters are certainly more marked in exotic than in British species.
Has read CD’s inquiry about proportional numbers of males and females born to domestic animals [see 5863] and outlines his theory regarding the factors determining the sex of offspring.
Found [Variation] full of interest. Has not yet made up his mind about Pangenesis; wants to hear what can be said against it.
Proportion of sexes in butterflies; discussion of subject at meeting of Entomological Society, London.
Attraction of males by female Lasiocampa quercus. [see Descent 1: 311–12.]
Sends a preliminary reply to CD’s query [5890]. Ten males to one female among captured micro-Lepidoptera. Six females to four or five males in those he has bred. HTS is aware this is diametrically opposed to information from [Alexander] Wallace and Bates, but the true proportion of sexes can only be ascertained by breeding.
Notes on sexual differences in British Hemiptera.
Comments on J. O. Westwood’s entomological nomenclature.
Discusses the organs for stridulation in Orthoptera [see Descent 1: 352ff].
On numerical proportions of sexes in insects; coloration. Dimorphism in dragonflies (Agrion) in which usual coloration is reversed in sexes [see Descent 1: 362–4].
Wallace seems to ride his hobby too hard.
CD’s queries on expression.
Sends photo of a native Australian.
Has sent his translations [of parts of Theodor Piderit, System der Mimik und Physiognomik (1867)].
Fritz Müller’s Für Darwin [1864] would sell if well translated. WSD would be glad to undertake it.
HM is certain his brother Fritz would like to see Für Darwin translated into English by Dallas. He will make arrangements with the German publisher.
Two friends are writing Darwinian works: Adolf Speyer on phylogeny of Lepidoptera
and August Röse on genealogy of mosses.
AG is writing notice of American edition of Variation [Nation 6 (1868): 234–6].
Pangenesis is "as good an hypothesis as one can now make".
Responds to CD’s queries on polygamy in birds and orang.
Discusses sexual selection and secondary characters; colours and sexual preference.
Expresses his admiration for Pangenesis; it is superior to Herbert Spencer’s theory.
ARW differs somewhat with CD’s chapter on causes of variability [ch. 22 in Variation]. Thinks several of CD’s arguments are unsound.
Briefly discusses how natural selection might aid in producing sterility between allied species.
