bodies, to warn mothers not to let their children fall out of the
window, would make himself ridiculous. Just so a sociologist who should
attach moral applications and practical maxims to his investigations
would entirely miss his proper business. There is the force of gravity
as a fact in the world. If we understand this, the necessity of care
to conform to the action of gravity meets us at every step in our
private life and personal experience. The fact in sociology is in no
wise different.

If, for instance, we take political economy, that science does not
teach an individual how to get rich. It is a social science. It treats
of the laws of the material welfare of human societies. It is,
therefore, only one science among all the sciences which inform us
about the laws and conditions of our life on earth. Education has for
its object to give a man knowledge of the conditions and laws of
living, so that, in any case in which the individual stands face to
face with the necessity of deciding what to do, if he is an educated
man, he may know how to make a wise and intelligent decision. If he
knows chemistry, physics, geology, and other sciences, he will know
what he must encounter of obstacle or help in Nature in what he
proposes to do. If he knows physiology and hygiene, he will know what
effects on health he must expect in one course or another. If he knows
political economy, he will know what effect on wealth and on the
welfare of society one course or another will produce. There is no
injunction, no "ought" in political economy at all. It does not assume
to tell man what he ought to do, any more than chemistry tells us that
we ought to mix things, or mathematics that we ought to solve
equations. It only gives one element necessary to an intelligent
decision, and in every practical and concrete case the responsibility
of deciding what to do rests on the man who has to act. The economist,