CD is "as ignorant of mechanics as a pig", but glaciers have interested him greatly. Hopes to hear that JT’s experiments with ice will explain the freezing together of ice below the freezing point.
Showing 21–40 of 146 items
CD is "as ignorant of mechanics as a pig", but glaciers have interested him greatly. Hopes to hear that JT’s experiments with ice will explain the freezing together of ice below the freezing point.
The variations of Peronea caused A. H. Haworth and J. F. Stephens to create 30 or 40 species based on colour and markings. HD was first to be convinced these would be reduced to two.
Discusses species that closely resemble one another;
cites species that differ in variation in different localities;
in some double-brooded species the broods differ markedly in size and colour.
Encloses his list of varieties of Peronea.
No summary available.
No summary available.
Sends information on the speed at which his pigeons fly various distances.
Discusses the ranges of alpine species in U. S. and considers the possible migration routes of such species from Europe.
Lists those U. S. genera which he considers protean and describes the U. S. character of some genera which are protean in Europe.
Describes how he distinguishes introduced and aboriginal stocks of the same species.
Is glad WED is in the sixth [form]. Discusses WED’s intention to become a barrister.
No summary available.
The species of Mollusca at Mauritius are almost all different from those of surrounding islands, which confirms the belief that the islands were elevated from the ocean rather than separated from the continent by volcanic action.
No summary available.
Voting to elect JL [a member of Athenaeum].
Thinking about HF’s paper on Plagiaulax [Q. J. Geol. Soc. Lond. 13 (1857): 261–82]. Owen might answer that all Purbeck mammals are marsupials.
HCW is trying to define what CD means by "variable" genera.
Comments on transport of ducks to Jamaica by hurricanes,
fish feeding on seeds,
and sterility of birds in captivity.
Describes problems of classifying species in highly variable genera. Lists highly variable genera. Comments on the list of Asa Gray. Says species may be made to appear more or less variable according to whether a genus is divided into few or many species.
Separation of sexes in trees [U. S.].
Do plants offer positive evidence for "continuous land" theory?
Protean genera.
Ranges of species in large vs small genera: Asa Gray’s compilation fits CD’s expectation.
CD studies seedling mortality in his weed garden.
JDH’s work on Indian flora.
Sends account of his successful experiments in feeding wheat seeds to minnows.
Reports on wheat in the stomach of fish he caught.
Independence of variation from climate shown by several plant genera; CD asks for confirmation.
Progressing with book [Natural selection].