Offers AD a puzzle and JH's solution to AD's problem about a body revolving in the evolute of an ellipse. On sending Francis Baily's correspondence to Greenwich.
Thanks JH for discovering an important error in a work WS asked him to proof read. Asks JH about a variable in Canis Minor over which there is some debate.
Thanks for having sent various publications; believes that the Academy's intention has been to send JH complete series; states which issues JH has not received.
Thanks THH for his response on glacial movement. Hopes Tyndall will experiment on broken ice and explain how two pieces of ice can freeze together.
Sorry to hear of THH’s row with Richard Owen.
No summary available.
No summary available.
No summary available.
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.
Have all varieties been bred from the same set of eggs so that there can be no doubt they are all the same species?
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.
Writes to arrange a visit to Collingwood.
Would welcome eggs of any rumpless fowl so that he can investigate how early in development rudimentary organs are rudimentary.
Has not noticed much difference between skeletons of ducks.
Sympathises with Brent’s legal difficulties. Declines offer of a cock silk fowl, but accepts offer of a German old fashioned pouter pigeon.
Has been absent from home, which accounts for his belated reply. Comments on JH's difficulties in relation to W. H. Hopkins's memoir on the external temperature of the earth. JH's son is progressing well.
JH has got hold of the explanation about central forces. Need not worry about Elizabeth Baily; he will see to that. Do not reject any letters; they may be important in the future. Gives one of his own theorems.
Birth of his sixth son [C. W. Darwin]. It is dreadful "to think of all the sendings to school and the professions afterwards".
CD is not well but has not the courage for water-cure again; trying mineral acids.
Working hard on the book [Natural selection]; is overwhelmed with riches in facts and interested in way facts fall into groups.
To his surprise [Helix pomatia] has withstood 14 days in salt water.
Pigeons’ skins come in from all parts of the world.
No summary available.
No summary available.
Sends information on the speed at which his pigeons fly various distances.
