Is trying to determine conditions governing whether or not a salmon will rise for a fly.
Is trying to determine conditions governing whether or not a salmon will rise for a fly.
Has heard that book by Alphonse M[ilne]-Edwards [? Recherches anatomiques et paléontologiques, 4 vols. (1867–71)] is excellent.
Asks when horns appear on young male fallow deer.
Answer to CD’s query as to whether horns on deer are for use or ornament. [See Descent 2: 252–3.]
Sends a paper on reproductive modes of Leptodera ["Organisation und Fortpflanzen von Leptodera", Schr. Ges. Beförd. Naturw. Marburg (1869)].
Criticises Ernst Haeckel’s work as too unripe and enthusiastic.
Asks CD for some specimens of cirripedes in pupal stage for a work in progress.
Believes Portuguese habit of removing tails of pointers is responsible for birth of some tailless dogs.
On development of horns in fawns of fallow deer.
Thanks JP for his book Vesuvius [1869].
Thanks CC for two memoirs [see 6575. The other was possibly "Die Cypris-ähnliche Larve der Cirripedien", Schr. Ges. Beförd Naturw. Marburg (1869)].
Haeckel is too enthusiastic and too bold in drawing conclusions.
CD sees no reason to add to what he says on isolation, in new edition of Origin.
Lists specimens he has available for CC’s intended study of metamorphoses of Lepas.
Argues that [general variability] of species, not single variations or sports, is basis for modification and adaptation to new conditions.
DF’s opinion of Gustav Jenzsch’s book [Mikroskopische Flora und Fauna (1868)]. Encloses extract of a letter from Ferdinand Zirkel also mentioning Jenzsch’s work.
Returns book with thanks. "Joyfully accepts" idea of the warming of Southern Hemisphere during glacial period in the Northern. Lyell is unwilling.
Mentions H. N. Moseley’s study of descent of glaciers [Proc. R. Soc. Lond. 17 (1869): 202–8].
CD greatly troubled by problem of age of the earth and calculations of Sir William Thomson. Asks about changes in the form of the globe.
Requests authorisation to translate Journal of researches into French.
Does not fact that characters important in systematics are often of no use, corroborate CD’s view that such characters, if not detrimental, may persist ad infinitum?
Social news.
Sends a letter from Capt Forrest, recommending a Mr Knight.
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No summary available.