Comments on JD's work in photography; JH goes on to talk about JH's ideas of 'chemical' rays of light.
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Comments on JD's work in photography; JH goes on to talk about JH's ideas of 'chemical' rays of light.
Sending a heliographic portrait taken from life. Comments on his methods.
Sending a Daguerreotype impression of the spectrum. Comments on this. Is publishing a work on the chemical rays.
Comments on writings of JD on the chemistry of plants [letter completed 1845-5-7].
Critiques JD's paper on plant chemistry, contrasting 'luminous, colorific, calorific, & chemical or photographic' rays. Physics of light. [Letter continues two months later.] JH is done with photography. Has no desire to claim priorities in that field. Entrusts future to JD and others.
Sends papers and new book on 'Chemical influence of Light' by JD. Received JH's papers. Apologizes for failing to give JH discovery credit. Notes on light interference.