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Thanks WTT-D for Drosophyllum seeds.
Will not sign a petition, for he feels vivisection is essential to the progress of physiology.
Has failed with his experiments on aerial roots.
Starlings seem to share their food. Are they communists as they struggle for their existence?
Describes movement of a caterpillar.
Sends his autograph to HR for the Galerie internationale [1880].
Thanks GBNH for a fact about CD’s grandfather [Erasmus Darwin], but he will not be able to use it in his brief notice.
FD’s experiment shows that caustic does not interfere with the bending of radicles. Believes that the apex is a kind of brain for certain movements, being specialised to receive certain irritations.
Stresses importance of ensuring that cauterisation of radicles does not, through injury, prevent movement. Plans an experiment to test for "apheliotropism" in certain radicles.
Heliotropism nomenclature. Apheliotropic mustard roots grow more quickly in dark. Measures growth with microscope as S. H. Vines did in mould. Studying air roots.
FD’s and Stahl’s negative opinion of Sachs.
CD gives suggestions concerning FD’s experiments on the radicles of roots. Asks him to find out whether J. von Sachs tried beans. Should also try other gramineous plants.
Bernard looking forward to his father’s return.
Francis wants a copy of a book on "Shakespeare’s merry tales" to present to a friend in Würzburg.
Sends proofs of his preface [to EK’s Erasmus Darwin], with which he is disappointed. Suggests additions and improvements he would like to make.
Inquires concerning a possibility of searching old deeds about the Darwin family history.