This book developed out of a survey course on African languages that Uriel Weinreich invited the author to teach at Columbia University. The focus of the course changed considerably in the years that the author taught the course (1964-1968), in large part to accommodate the interests of many students without a background in linguistics but registered for the course. The one thing African languages have in common, setting them off from all the other languages in the world, is the fact that they are spoken in Africa.