Observations of cloud patterns after storms.

Proposes modification to balloon gondola for scientific research.

Explains how to detect errors in catalogued positions of stars. List of new nebulae in [G. F. J. A.] Auwers's catalogue.

Proposes hypothetical problem in physics of gravitation involving three unequal bodies falling equal distances. Asks JH to respond in Good Works.

Received some proof sheets this morning of the Appendix to CL's book on the Antiquity of Man. Has read through the book with great interest. Comments on various points. Will have to revise their ideas on the length of human existence. Has had another letter from Twisleton so supposes he must try and write on science in schools. Have had sickness for the first three months of the year.

JH criticizes [Robert] Mallet's views on the nature of earthquakes and the upheaval of the earth.

Supports G. P. Bond of Harvard College for foreign membership of R.S.L.; proposes H. E. Sainte-Claire Deville for the Rumford Medal, for his development of a high temperature laboratory furnace applied to metallurgy and the 'disseverance' of the hydrogen and oxygen of water.

Asks JH to review paper on Aristotle's physics by George Henry Lewes, whose letter to GS is enclosed.

Thanks JH for reviewing George Henry Lewes's paper [see GS's 1863-12-16].

Note accompanying payment for 'Notes on Science' for Cornhill Magazine.

Sends GA [see GA's 1863-11-21] JH's copy of the Melbourne telescope correspondence and reports; needs information from GA and Edwin Dunkin about the sun's motion, although JH questions some of Dunkin's work.

Does JH need the original calculation sheets to deal with the errors in the nebula catalogue [see GA's 1863-2-23]?

Thanks GA for the papers sent; asks GA to review enclosed note on solar motion [see JH's 1863-11-22].

Thanks WC for a copy of a paper published by WC in the P.M.

Introduces JH's son Alexander to PS, and hopes PS will support Alexander, who is seeking to become Assistant Secretary of the Royal Geographical Society.

Responds with thanks to GT, a fellow trustee of the British Museum, who has written to welcome JH and congratulate him on his election. JH is concerned about having enough time to fulfill his obligations.

Writes to FM to show several ways in which a series of prisms may be used in a spectroscope to have the light exiting in the same line as it entered the spectroscope. [Appends 4 pages of diagrams.]

Comments on the ease of calculation in geodesy in JH's version of the English system of units, and asks GA for some clarifications as JH prepares the seventh edition of his Outlines Astr.

RR's brother-in-law values proximity to Collingwood. Discusses flora and the state of botanical science at the Cape. Sends letter from colonial botanist.

Wrote to [A.] Sawitsch regarding Russian pendulum experiments. Encloses Sawitsch's reply. Discusses experimental possibilities.