Serial homologies in the Mollusca. Gives instances of repetition of homological parts in Radiata.
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Serial homologies in the Mollusca. Gives instances of repetition of homological parts in Radiata.
Outlines the basic categories of phanerogams.
Places Gymnospermae in the dicotyledons.
Evaluates the variable utility of embryological characters in plant classification.
Sends MS [of Origin] on geographical distribution. Wants JDH to correct facts and say what he most vehemently objects to.
Has received JDH’s note on plant embryology.
Writes of events at Down: mostly of playing billiards on their new table.
Will finish last chapter (except recapitulation) tomorrow.
Pleased with JDH’s response to geographical distribution chapter;
CD disagrees with Lyell’s view that glacial epoch is connected with position of continents.
Embryology of Diptera. Development of insects; metamorphosis. JL feels all insects go through metamorphosis but that in some of them, part takes place before birth.
Wants JL’s opinion on paper by L. J. M. Dufour ["Études anatomiques sur les insectes diptères de la famille des pupipares", C. R. Hebd. Acad. Sci. 19 (1844): 1345–55].
Hopes Murray will publish after seeing MS [of Origin].
Demurs at JDH’s saying that CD changes climate to account for migration of bugs, flies, etc. "We do nothing of the sort; for we rest on scored rocks, old moraines, arctic shells, and mammifers." Has given up the Lyellian doctrine as insufficient to explain all changes in climate; CD has no theory about the cause of the cold.
Discusses WED’s plans for the summer.
Lyell has been strongly urging John Murray to publish CD’s book [Origin]. JDH feels Lyell overestimates the public interest in such works.
Gives examples of plants showing most marked varieties on the edge of their range.
Thanks for letter of caution about Murray. He has offered to publish without seeing MS. CD thinks book will be popular to a certain extent. Lyell’s inducing Murray to publish Origin grates CD’s pride.
Has read first sheets of JDH’s Flora Tasmaniae [introductory] essay [published separately as On the flora of Australia (1859)]. Criticises lack of evidence supporting views that best marked varieties occur at edges of range of species and that species remain under cultivation for many generations and suddenly begin to vary.
Murray has read first three chapters of Origin and abides by his offer to publish.
CD agrees cultivated plants may begin to vary after some time and then may vary suddenly, but cautions JDH on lack of evidence. His explanation is that small variations are ignored until they accumulate.
Questions about stripes on mules.
Reports his observations on the habits of slave-making ants (Formica sanguinea).
CD favours occurrence of reversions, although lack of experiments forces one to vague opinions. Reversions oppose only the inheritance not the occurrence of variation. Discusses relation of reversion, direct influence of conditions, and selection.
JDH’s comments on style of Origin MS leave CD confused.
CD advises on how to get Acacia to set seed.
JDH finds style of CD’s MS obscure.
CD wary of JDH’s starting point on variability: it is not inherent, it does not lead necessarily to divergence, and it must be distinguished from inheritance.
Asa Gray has misread CD’s views on pre-glacial migrations and botched the subject.
Too ill to examine proofs of JDH’s Flora Tasmaniae [The botany of the Antarctic voyage, pt III].