Thanks for Thomas Belt’s Naturalist in Nicaragua [1874], which confirms some of his observations,

and for Insectivorous plants, which he praises.

Suggests that a book integrating knowledge of plant–animal interactions be written by a Darwinist.

Defines biology as the science of external interactions.

German reception is far more positive than Italian.

Sends last part of his book [Ulteriori observazioni sulla dicogamia (1868–74)] [osservazioni!?] and describes contents.

Looking forward to publication of Insectivorous plants, which he will review.

Paul Mantegazza has criticised FD on insectivorous plants

and CD on sexual selection; FD maintains dichogamy in plants supports sexual selection.