text:  Among the rudest tribes of men hunters and savage inhabitants of forests dependent for their supply of food on the accidental produce of the soil or on the chase among whom are the most degraded of the African nations and the Australian savages a form of the head is prevalent which is most aptly distinguished by the term _prognathous_ indicating a prolongation or extension forward of the jaws; and with this characteristic other traits are connected which will be described in the following pages