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Congratulates AD on a successful move to a new house.
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Recounts experiments JH conducted on the action of the solar spectrum on various silver salts. Explains how JH produced his solar spectrum.
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Received JH's 'Remarks on Colour-Blindness' [1859]. Describes lack of success in urging Army, Navy surgeons to continue GW's investigations. Comments on statistical distribution of color-blindness, hereditary factors, and safety implications for military and railroads. Reports specific cases among contemporaries. Asks JH's advice on seeking assistance from B.A.A.S.