st, who
constructs, or used to construct, a science out of a single quality
common to the whole material world.

The facts when collected must, because they are many, be arranged. I
believe that it would be found convenient by the political student to
arrange them under three main heads: descriptive facts as to the human
type; quantitative facts as to inherited variations from that type
observed either in individuals or groups of individuals; and facts, both
quantitative and descriptive, as to the environment into which men are
born, and the observed effect of that environment upon their political
actions and impulses.

A medical student already attempts to master as many as possible of
those facts about the human type that are relevant to his science. The
descriptive facts, for instance, of typical human anatomy alone which he
has to learn before he can hope to pass his examinations must number
many thousands. If he is to remember them so that he can use them in
practice, they must be carefully arranged in associated groups. He may
find, for instance, that he remembers the anatomical facts about the
human eye most easily and correctly by associating them with their
evolutionary history, or the facts about the bones of the hand by
associating them with the visual image of a hand in an X-ray photograph.

The quantitative facts as to variations from the anatomical human type
are collected for him in statistical form, and he makes an attempt to
acquire the main facts as to hygienic environment when and if he takes
the Diploma of Public Health.

The student teacher, too, during his period of training acquires a
series of facts about the human type, though in his case they are as yet
far less numerous, less accurate and less conveniently arranged than
those in the medical text-books.

If the student of politics followed such an arrangement, he would at
least begin his course by mastering a treatise on psychology, containing
all those facts about the human type which have been shown by experience
to be helpful in politics, and so arranged that the student's knowledge
could be most easily recalled when wanted.

At present, however, the politician who is trained for his work by
reading the best-known treatises on political theory is still in the
condition of the medical student trained by the study of Hippocrates or
Galen. He is taught a few isolated, and therefore distorted, facts about
the human type, about pleasure an