The Keystone of Evolution
Natural selection has been the most popular theory to explain evolutionary processes since Darwin wrote On the Origin of Species.
Up until the present time more than a million species of animals and a million species of plants have been identified. What can be the cause of this diversity? How manv more species await discovery? Is the species the essential element of evolution?
Ernst Mayer , Professor of Zoology at Harvard University, in conversation with John Maddox
Editor THELMA RUMSEY followed by an interlude