Chapter XIX: The Nature of Tradition 407

(1) The evolution of conceptual thought went hand in hand with
that of language, (2) and has passed through a series of stages.
(3) The products of conceptual thought are stored up in various
ways, (4) are transmitted by language and by the operation of
suggestion and sympathy, and (5) are retained by habit. (6) In a
relatively unimportant way tradition is present among the higher
animals. (7) Tradition moulds the degree and direction of the
use of mental faculties, and (8) is naturally selected.