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CD’s enjoyment of the beauty of the tropics is worth all the misery of seasickness. His mail gave him great pleasure. For two weeks he will visit a large estate in the country, and on return live at Botofogo for some weeks, collecting and learning to know the tropics.
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Must decline invitation to dinner due to poor health.
Wonders how JH's projected volume on Astronomy is progressing. Would also like a short biography of Francis Bacon.
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Discusses study of light, JH's theories on the subject, and his own photometer observations. Asks JH for further explanations of his theory.
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JG is revising his diary.
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Has received the chronometer and will return it to Lister, together with his remarks on apertures. Charles May has found another individual suffering from color blindness. A friend has successfully made a reflecting microscope.