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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.
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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.
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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.
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Writes to arrange a visit to Collingwood.