Most Popular Books
- Darwinism And The Problems Of Life: A Study Of Familiar Animal Life
- A naturalist in Brazil;: The flora and fauna and the people of Brazil,
- A Naturalist in Brazil. The Record of a Year's Observation of Her Flora, Her Fauna, and Her People.
- Der Darwinismus und die Probleme des Lebens.
- Darwinism and the Problems of Life; A Study of Familiar Animal Life
