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[Responding to WT's 1826-2-7], JH thanks WT for materials sent, makes suggestions regarding WT's upcoming trip to Geneva, and asks WT to deliver a book to [Alfred] Gautier.
[Responding to WT's 1826-3-24], JH concurs with P. S. Laplace's view about the advantage of astronomical observation from high elevations, e.g., from mountains. Comments on telescope prices, a paper by WT, Florence, and JH's plan to visit the Continent.
Thanks WT for bringing to JH Josef Fraunhofer's publications and Franz Gruithuisen's plates. Recounts JH's geologizing in France and JH's efforts to measure solar radiation.
Thanks WT for optical equipment sent. Notes death of Augustin Fresnel. Has purchased a telescope from James South.
Responds to WT's 1827-10-29. Sending JH's Light, which uses some of WT's publications.
Asks about a servant JH is considering hiring to accompany JH on JH's trip to the Continent.
Signing certificates for election to fellowship in the R.S.L. at this time [JH having been nominated for President] would be very awkward for JH, so he will not sign for WT.
Sending WT some seeds. Had hoped to send some bulbs.
Is sending WT some botanical specimens through Andrew Smith, whose scientific abilities JH praises. Asks WT to assist Smith in England. Encourages WT's work in mathematics and in 'photology.' Reports on JH's astronomical observations and theorizes about sunspots.
Thanks for specimens of [light] 'sensitive paper.' Praises it. JH has handed over all his specimens of photography to R.S.L. Recommends a paper by the chemist Henri Regnault.