nature of that influence which external circumstances
and physical and moral causes exert in the- production of
varieties, and in modifying the organic* qualities of different
races , of meny-is an inquiry of secondary importance» iu reference
to the principal object of this part of my work. The
primary .question is,‘ whether any and what deviations have
actually taken place in the physical characters of particular
tribes within the period of time to which the evidence of history
reaches back.
J I shall proceed,-in the first instance, to survey the races.of
men which constitute the population, of Africa. This .is one
of the most important and difficult parts of my subject, and
will require the most careful and the fullest investigation^;
BOOK III.
R E S E A R C H E S
IN T O ; T H E
PHYSICAL ETHNOGRAPHY
O F T 1 IK
AFRICAN1 RACESJ
