The modern "science" of racism was born quite recently, with the treatises by R. Knox (The races of men, 1850) and A. de Gobineau (Essai sur l'inegalite' des races humaines, 1853-1855). The anthropological concepts introduced by Knox and several other students were soon demonstrated untenable by R. Virchow, whose first study on the subject was carried out in 1865.
Franz Boas was born in Germany and was a great admirer of Virchow; after moving to the USA he contributed to found the science of anthropology in the Americas, made several field studies (notably on the esquimo people of Greenland) and fiercely opposed racism.
Anthropology and modern life is a late work by Boas, which appeared in 1928, when its author was seventy years old. It is not a scientific treatise of anthropology; rather it is a divulgative book in which Boas demonstrates how anthropological studies can correct prejudices and wrong ideas on society, and plainly shows why racial theories cannot be applied to humans. The text is easily readable to everybody and uses statistical concepts to an absolute minimum; yet it is rigorous and makes clear that race is an artificial category that can be created through inbreeding in farming animals and plants, but is not observed in natural populations. It is a sad observation that the racist laws enforced by Nazi Germany and Fascist Italy in the XX century were based on concepts that had been demonstrated obsolete since several decades.