Recounts the experiments on Fechner’s law he has found in Helmholz; they are on the smallest perceptible differences of illumination. Describes how to test whether plants’ responses to lights are in accordance with it.
Recounts the experiments on Fechner’s law he has found in Helmholz; they are on the smallest perceptible differences of illumination. Describes how to test whether plants’ responses to lights are in accordance with it.
Encloses William Thomson’s report on GHD’s paper. Some of it was written in Rayleigh’s hand.
Asks CD if he would screw himself up to inviting A. Newton to Down.
Thanks CD [for his increased allowance?].
Writes of his tour [in Algeria].
Encloses some references [missing] to information on Dr Erasmus Darwin.
Sends CD an article on Dr Erasmus Darwin [from Monthly Magazine, see 12028].
Tells of a "discovery" he has made about taking observations of the sun. Does not know yet whether it is new.
Sends abstracts of more articles [on Dr Erasmus Darwin] from Monthly Magazine.
Sends some papers on Erasmus Darwin for CD.
Sends results of his researches on the Darwin family at the Record Office.
Has written to Col. J. L. Chester [genealogist] to ask whether he would like to see the deeds [for Darwin genealogy, see Emma Darwin 2: 237].
Sorry to hear Henrietta’s opinion of the [Erasmus Darwin] proofs. GHD did not think it dull. He makes some suggestions.
Erasmus thinks CD should give a copy of Erasmus Darwin to Henry Parker.
Gives CD some information on wills.
Is leaving tonight for Genoa;
sends a French paper [not identified].
Discusses buying a horse [for CD].
Conveys some information on a quiet horse which CD may be able to purchase from a riding school.
Believes he has found a quiet cob suitable for CD. Encloses a letter for CD to sign and send to the owner if he approves the idea.
Comments on points made in Hensleigh Wedgwood’s letter [7470] on moral sense in Descent.
Has arranged a trip to the U. S. with Cambridge friends; believes it would be much jollier if Frank could go too.
Mentions some photos relating to expression.