Mayr has shown himself to be a true follower of Darwin, Wallace, and Huxley. His writings are lively and critical, and they provide remarkable insight into the development of the field.
-- Peter H. Raven Science
The range of topics covered in these essays is awesome when one realizes that they are the product of a single mind.
-- Francisco J. Ayala Sciences
Ernst Mayr not only ranks among the great evolutionary biologists of this century; he is also one of the best writers. This collection is of lasting importance.
-- E. O. Wilson