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Wants to make a new musical instrument on the principle of resonance; JH also suggests some improvements in the construction of the organ.
Celebration planned for arrival of MH and IH. Son John is home from Addiscombe. JH's health. News of Hawkhurst. Regards to Mr. and Mrs. Greig.
Writes to clarify his understanding of the word 'fluorescence.' Asks JH to review a paper on color-blindness.
Comments on a proposed grant to publish T. R. Robinson's Armagh observations.
Regrets letter read the night before at the R.A.S. of JH's wish to resign and hopes JH's health allows him to come occasionally and be a nominal member. Discusses Piazzi Smyth's preparations for voyage to Teneriffe.
Some more information on the use of the actinometer [see JH's 1856-4-24 & GA's 1856-6-3]; some news of JH's wife, Margaret.