The genetic factor in population ecology / L.C. Birch -- Experimental studies on natural selection in the butterfly, Maniola jurtina / W.H. Dowdeswell -- Larval color pattern in Papilio demodocus / C.A. Clarke, C.G.C. Dickson, and P.M. Sheppard -- House sparrows : rapid evolution of races in North America / R.F. Johnston and R.K. Selander -- Selection response and genetics of parathion resistance in the Pacific spider mite, Tetranychus pacificus / L.A. Andres and T. Prout -- Regional differentiation in plant species / J. Clausen, D.D. Keck, and W.M. Hiesey -- Taxonomic and evolutionary implications of lawn races in Prunella vulgaris (Labiatae) / A.P. Nelson -- Stage of speciation of two allopatric populations of chorus frogs (Pseudacris) / W.F. Blair and M.J. Littlejohn -- Allochronic speciation in field crickets, and a new species, Acheta veletis / R.D. Alexander and R.S. Bigelow -- Character displacement / W.L. Brown Jr. and E.O. Wilson -- The evolutionary implications of the cytological polymorphism and phylogeny of the virilis group of Drosophila / W.S. Stone, W.C. Guest, and F.D. Wilson -- The origin of Clarkia lingulata / H. Lewis and M.R. Roberts -- Evolution in the genus Cucurbita / T.W. Whitaker and W.P. Bemis -- Hybridization of the habitat / E. Anderson -- Ancestor of corn / P.C. Mangelsdorf -- Hybridization and introgression in Cowania and Purshia / H.C. Stutz and L.K. Thomas -- Hybridization in the buntings (Passerina) of the Great Plains / C.G. Sibley and L.L. Short Jr. -- Natural hybridization and amphiploidy in the genus Tragopogon / M. Ownbey -- The endemic fish fauna of Lake Lanao, and the evolution of higher taxonomic categories / G.S. Myers -- Homage to Santa Rosalia; or, why are there so many kinds of animals? / G.E. Hutchinson -- Experimental studies of mimicry in some North American butterflies. Part I, The monarch, Danaus plexippus, and viceroy, Limenitis archippus archippus / J.V.Z. Brower -- Chromosome variability and geographic distribution in insects / B. John and K.R. Lewis -- Evolution of the horned dinosaurs / E.H. Colbert -- History of the fauna of Latin America / G.G. Simpson -- The bearing of the living Metasequoia on problems of Tertiary paleobotany / R.W. Chaney -- Evolution of the psilophyte paleoflora / D.I. Axelrod -- Evolution of the nests of bees / C.D. Michener -- The significance of floral constancy among bees of the genus Diadasia (Hymenoptera, Anthophoridae) / E.G. Linsley and J.W. MacSwain -- A fossil ant colony : new evidence of social antiquity / E.O. Wilson and R.W. Taylor -- Some problems and guiding principles of angiosperm phylogeny / R.F. Thorne -- A method for deducing branching sequences in phylogeny / J.H. Camin and R.R. Sokal -- Construction of phylogenetic trees / W.M. Fitch and E. Margoliash -- Man and natural selection / T. Dobzhansky -- The crucial evidence for human evolution / W.E. Le Gros Clark -- Early man in East Africa / P.V. Tobias -- The analysis of primate evolution with particular reference to the origin of man / S.L. Washburn -- Ecology and the protohominids / G.A. Bartholomew Jr. and J.B. Birdsell -- How many people can the world support? / J.H. Fremlin
