Common scientific lectures on development theory, parts I and II.
Including a the portrait of the author (Ernst Haeckel) and 30 plates, as well as numerous woodcuts, family trees and systematic tables.
The book has a half leather cover.
One of the main works of the eminent morphologist in the field of Darwinism and development theory. Here Haeckel attempted to summarize his ideas developed in General Morphology in an understandable way for laypeople.