Mentions RH’s book on light [Researches on light in its chemical relations, 2d ed. (1854)]. Asks about coloured glass used in experiments on plants.
Mentions RH’s book on light [Researches on light in its chemical relations, 2d ed. (1854)]. Asks about coloured glass used in experiments on plants.
Informs CD which colours of glass accelerate germination, lignification, and floriation; advises CD on obtaining such glass and offers his help in any experiments.
Mentions experiments on plants involving coloured glass. Encloses correspondence from glass maker and asks advice.
Encloses a sketch of the principal events in his life [for RH’s memoir on CD in Walford, ed., Portraits of men of eminence (1863–7)].
Has been requested by the Editor of the Quarterly Journal of Science to write a paper on JH and modern astronomy. Would like JH's sanction, and also a few notes on the most important aspects.
In response to RH's 1867-10-28, JH sends a list of his writings on astronomy.
Is grateful for his letter and will study the memoirs to which he refers. The Editor would also like a photograph; can JH oblige?