Orders large pot of spermaceti ointment.
Orders large pot of spermaceti ointment.
Declines invitation.
CD likes Down House, describes countryside.
Tells of Edward Charlesworth fracas at Geological Society.
Is at work on Volcanic islands.
Thanks for Maclaren’s Sketch (Maclaren 1839 bibl_5120).
Has seen WK’s views on Rubers Law and commiserates with him on William Buckland’s disapproval.
David Milne (later David Milne Home) is preparing a paper on the geology of Roxburghshire. (Presumably Milne, David. 1842-3. Geological account of Roxburghshire. Transactions of The Royal Society of Edinburgh (15) 1844, pp. 433-502.)
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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.
Was very pleased with the specimen JH sent him; it is still in good condition. Has he read [John William] Draper's paper? Comments on some of the points. Outlines some of his own proposed experiments.
Much indebted for his paper on the influence of the solar spectrum on vegetable colors. Has a series of experiments ready that he hopes will resolve some of his own doubts. Does not like the term J. W. Draper uses for the new rays.
Sends a few samples of plates made by the cyanotype process; they are poor because the sun has not been very strong of late. Comments on this process and wishes JH would make a few experiments with his more perfect apparatus. Inclined to agree with him about the mechanism of the eye.
Sends CW a specimen of JH's 'mercurial photographic process.' JH is pleased that W. H. Fox Talbot received the Rumford medal.