Chemical evolution / Melvin Calvin
The evolution of brain achievements / Bernhard Rensch
Variation and the taxonomy of the early hominids / J.T. Robinson
Adaptive radiation and trends of evolution in higher plants / G. Ledyard Stebbins
Permanent heterozygosity / Hampton L. Carson
Use of computers in studies of taxonomy and evolution / David J. Rogers, Henry S. Fleming and George Estabrook
Biochemical systematics / Ralph E. Alston
Genetic loads in maize (Zea mays L.) and other cross-fertilized plants and animals / D.W. Crumpacker.