Similarities of cultural traits, 155.—Explained as due to
the influence of environment, 159.—Cases of lack of
adjustment to environment, 162.—Influence of former
environment, 163.—Similarities explained as survivals
of times antedating dispersion of human species,
164.—Dissemination, 166.—Areas of dissemination,
169.—Similarities explained as due to sameness of
elementary ideas, 171.—Psychological explanation, 173.