Discusses coral reefs
and encloses a copy of his "Reisebericht" [Z. Wiss. Zool. 13 (1863): 538–70], as requested by CD.
Discusses coral reefs
and encloses a copy of his "Reisebericht" [Z. Wiss. Zool. 13 (1863): 538–70], as requested by CD.
Comments on G. H. Lewes’s book [The life and works of Goethe (1855)].
Explains why he did not add his photograph to the album presented by German naturalists to CD. Instead he wishes to dedicate to CD his work on the vertebrate-type eyes on the back of some Mollusca. [Enclosed is a MS introduction to this work, Über Sehorgane von Typus der Wirbelthieraugen auf dem Rücken von Schnecken.].
Sends work on dorsal eyes of Onchidium ["Über Schneckenaugen", Arch. Mikrosk. Anat. 14 (1877): 118–24]. Comments on work.
Thanks CD for his kind letter and accepts his offer of a writing machine.
Thanks CD for writing machine.
Recalls visit by CD’s son [Francis].
Asks whether he may use CD’s letters in his work [Die natürlichen Existenzbedingungen der Thiere (1880)] in order to show that Moritz Wagner has misrepresented CD’s views.
Discusses the influence of isolation and external conditions on animals, and the relative importance of the direct effect of external conditions and of selection in bringing about change.