lippines will be able to
break it only by military interference.[512]

[Sidenote: Differentiation of coast from inland people.]

Differences of occupation, of food supply, and of climate often further
operate to differentiate the coast from the inland people near by, and
to emphasize the ethnic difference which is almost invariably present,
either inconspicuously from a slight infusion of alien blood, or
plainly as in an immigrant race. Sometimes the contrast is in physique.
In Finisterre province of western Brittany, the people along the more
fertile coastal strip are on the average an inch taller than the
inhabitants of the barren, granitic interior. Their more generous food
supply, further enriched by the abundant fisheries at their doors, would
account for this increased stature; but this must also be attributed in
part to intermixture of the local Celts with a tall Teutonic stock which
brushed along these shores, but did not penetrate into the unattractive
interior.[513] So the negroes of the Guinea Coast, though not immune
from fevers, are better nourished on the alluvial lowlands near the
abundant fish of the lagoons, and hence are often stronger and better
looking than the plateau interior tribes near by. But here, again, an
advantageous blending of races can not be excluded as a contributing
cause.[514] Sometimes the advantage in physique falls to the inland
people, especially in tropical countries when a highland interior is
contrasted with a low coast belt. The wild Igorotes, inhabiting the
mountainous interior of northern Luzon, enjoy a cooler climate than the
lowlands, and this has resulted in developing in them a decidedly better
physique and more industrious habits than are found in the civilized
people of the coasts encircling them.[515]

[Sidenote: Early civilization of coasts.]

Where a coast people is an immigrant stock from some remote oversea
point, it brings to its new home a surplus of energy which was perhaps
the basis of selection in the exodus from the mother country. Such a
people is therefore characterized by greater initiative, enterprise, and
endurance than the sedentary population which it left behind or that to
which it comes; and these qualities are often further stimulated by the
transfer to a new environment rich in opportunities. Sea-born in their
origin, sea-borne in their migration, they cling to the zone of
littoral, because here they find the conditions which they best know how