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Acknowledges the proof sheets of the new edition of the Physical Geography of the Sea. Will read them with the attention they deserve. Does not at present agree with the theories of MM.
A. D. Bache reports that self-recording instruments are installed at Washington observatory and ready to begin observations. ES is making field observations to confirm changes in magnetic lines in England since ES's 1837 survey. [JH annotation: Summary of Bache's letter. Joint survey by Smithsonian Institution and U.S. Coast Survey will begin when Bache receives full instructions from Sabine.]
Does JH wish to alter ES's reply to A. D. Bache? Origins of names for American rivers. Hopes JH is well enough to accept the invitation of Lord Aberdeen [G. Hamilton-Gordon].
Replied to J. A. da Silva that Kew Observatory would gladly train Portuguese observers and superintend manufacture of instruments, but that ES could not speak for English government. [JH annotation: Summary of letter from da Silva, director of meteorological observatory in Lisbon, requesting training for Portuguese observers at Kew, British influence on Portuguese government to join magnetic survey, and advice on instruments.]
Sees no need for changes to the plates for Outlines Astr.
Discusses desirability of middle latitude stations in North America. Impressed by the work of [A. D.] Bache.
Sends newspaper article about the meteor fall in Oswego County. Compares the account to a meteorite that fell in the Santiago Plains of Chile. Discusses authenticity of suspected meteorite specimens.
Thanks for his interesting communication to the Photographic News and for the spectra. Gives details of his own photographic experiments with Iodide of silver.