Thanks for EK’s book [Werden und Vergehen (1876)].

Regrets he cannot write for EK’s journal, but his son, Francis, may do so.

Suggests EK as editor urge on readers [of Kosmos] the investigation of the causes of variability; why, for instance, do wild Pampas cattle change colour when domesticated? Thinks experiments and observations on recently domesticated animals and cultivated plants would throw light on the subject.

CD interested in EK’s argument against belief that sense of colour has been recently acquired by man. Describes his observations of the difficulty his own children had in distinguishing, or naming, colours.

Adds that it appeared to him the gustatory sense of his children, when young, differed from that of grown-up persons.

EK may publish a translation [of "Sketch of an infant"] if he wishes, but CD hardly thinks it deserves the honour.

Glad to hear that Kosmos succeeds fairly well; has found several articles interesting.