Originally published in 1945, this volume represented the first to classify Bantu languages. This volume does not record all the dialects but makes reference to those in which some grammatical study has been done and classifies them according to mainly geographical zones. Owing to tribal migrations, individual members of a particular zone may be living among members of a different zone (as has been the case with the Ngoni, South-Eastern Zone, who are found among the Eastern Bantu), but the zone label is taken from the habitat of the majority.