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Memorandum of geological instructions to guide ABU during a voyage of [Constitucion] to survey the coast of Peru.
Living quietly on the ship and eating good food has been good for him. He longs for home. Peru is in a miserable state.
Accepts JH's suggestion about using the offered money for publication costs [see JH's 1835-6-12]; is concerned about the telescope at Cambridge, as G. B. Airy has left for Greenwich; final comments on the comet's effects and the weather.
Has received the printed copy of JH's observations on nebulae from Naples. Hopes JH will return to England via Sicily.
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Believes that TM is the first to see the return of Halley's Comet [see TM's 1835-9-1].
Comments on CW's work on light and on the velocity of electricity. JH's ruminations lead him to the idea of motion pictures.
Sends information about where to look for Encke's comet.
Congratulates GA on being honored by H. M. Government [GA was offered a knighthood, which he declined], and of being appointed Astronomer Royal, and further tells GA about some of JH's observations, and the instruments in use [letter finished 11 Oct.].
Has not had any success in finding comets.
JH is chagrined to note that he forgot to observe the equinox, after having impressed on any and all the need to do so.