Until the first publication of the Geography of Intellect in 1963, the study of human intelligence, its distribution and causes, had been confined to inaccessible scholars' journals. With the publication of works by Carleton S. Coon, Ernst Mayr and others-dealing with the evolution of man and his various sub-groups-has grown a strong popular interest in the findings of anthropological science: What has made man? Why do his civilizations rise and fall? How can we make certain that our current rate of material progress is maintained or increased, that we do not fall into the graveyard of civilizations wherein are buried Periclean Greece, Imperial Rome, Post-Inquisition Spain, Islamic civilization and the monstrous Nazi regime?