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Sending papers on actinochemistry (photography). Discusses [James] Forbes's viscosity theory, nebulae of Southern Hemisphere, great refractor at Collegio Romano, and Lord Rosse's telescopes.
Discusses MS's light experiments. JH will present the results to Royal Society. Describes apparatus that may help her. Recently attended a meeting concerning continental magnetics and meteorology.
Has noticed a resemblance between [Alexander von Humboldt's] Kosmos and MS's chapter, 'On Man,' in her manuscript. Advises her to revise. Sends results of observations at the Cape.
Augustus DeMorgan and [Henry Fox] Talbot are sending their papers to her. Family is well. Outlines a process of photography.