The biological problem of today : preformation or epigenesis? The basis of a theory of organic development, by Professor Dr. Oscar Hertwig. Authorized translation by P. Chalmers Mitchell, M. A. With an introduction by the translator and a glossary of the technical terms
- Hertwig, Oscar, 1849-1922; Mitchell, P. Chalmers Sir, (Peter Chalmers), 1864-1945
- New York,The Macmillan co.