1) Scientific American, 2)A Comparative Study of Chromosomal Ploymorphism In Sibling Species of the Willistoni Group of Drosophila, 3) The Chromosomes of Drosophila Willistoni, 4) Some Attempts to Estimate Species Diversity and Population Density of Trees in Amazonian Forests, 5) Local and Seasonal Variations in Relative Frequencies of Species of Drosophila in Brazil, 6) Evolution in the Tropics, 7) Heredity, Environment, and Evolution, 8) An Appraisal of Charles Darwin's Historical Role, 9) Book Reviews, 10) The Genetic Basis of Evolution, 11) Journal of the History of Medicine, 12) Bichromosomal Synthetic SEmilethals in Drosophila Pseudoobscura, 13) Mendelism, Darwinism, and Evolutionism, 14) A Geneticist's View of Human Equality, 15) IV.

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