Sends photographs of himself and his late wife [Anna Sethe]. Describes death of his wife.
Plans trip to the Alps.
Thanks CD for biographical information about himself.
Mentions Goethe as early evolutionist.
Cites Kant as early supporter of epigenesis.
Mentions criticism of CD’s theory by R. A. von Kölliker ["Über die Darwin’sche Schöpfungstheorie", Z. Wiss. Zool. 14 (1864): 174–86].