frequent contact of persons, division of labor, competition
between individuals, a better coordination of society for
cooperative results, neutralization of physical qualities, and
the ascendancy of innovation over the conservative attitude. It
is not the mere density of population which is the effective
element. It is rather the dynamic density which is productive,
that is, the manifestation of the common life and spirit. City
life is specialized in structure and function, rendering men
more interdependent and cooperative. Specialization means moral
coalescence

The chateaux of France are very prolific in producing talent.
They yielded 2 per cent. of all the talent of the period,
seemingly out of proportion to their importance.

Why are certain of the cities and the chateaux more fertile
than most cities and the country in producing the talented? We
have a general reply in the statement as to the dynamic density
of cities. A further analysis finds those communities are
possessed of elements which the country does not have. Odin
calls them "properties." They are the location of the
political, administrative and judicial agencies of society;
they are in possession of great wealth and talent; they are
depositories of learning and the tools of information. The
avenues which open upon talent and the tools and agencies by
means of which the passage to it is to be made segregate
themselves in cities and towns

As the result of his investigation into the distribution of men
of science in the United States, Professor Cattell arrives at