quisitiveness" to inquiry. To be inquisitive means
merely to want to know facts rather than to solve problems.
To be scientifically inquiring is to seek on one's own account
the significant relations between things. But these earlier
and more casual forms of curiosity are not to be despised. If
developed and controlled they lead to genuinely disinterested
study of Nature and of men, to the spirit and the methods of
science. That free play of imagination which was spoken of
above as the chief source of original thinking and discovery
is stimulated by an active hunting-out of new suggestions.
Curiosity might also be defined as aggressive imagination,
which, frequent enough in children, remains among adults to
a pronounced degree only in geniuses of art and science. We
may not agree with Bertrand Russell that "everything is done
in education to kill it," but the dogmatism and fixity of mind
which so soon settle down on maturity, the inability to be
sensitive to new experiences, these are discouragingly familiar
phenomena clearly inimical to science and to progress.

An active imagination that finds new materials to play
over is the basis of both science and art. A skillful manipulation
of its materials in words or sounds, colors, or lines makes
its result art. Their controlled examination and systematization
makes them science.

QUIESCENCE--FATIGUE. That all life, animal and human,
is characterized by activity of a more or less persistent and
positive kind has already been noted. But in human beings,
as well as in animals, activity displays a "fatigue curve."
The repeated stimulation of certain muscles produces
fatigue toxins which impair the efficiency of response and
make further stimulation painful. Of the causes of this
lessened functional efficiency we may quote from Miss Goldmark's
painstaking study:

During activity, as will be shown later, the products of chemical
change increase. A tired person is literally and actually a poisoned
person--poisoned by his own waste products. But so marvellously
is the body constructed that, like a running stream, it purifies itself,
and during repose these toxic impurities are normally burned up by
the oxygen brought by the blood, excreted by the kidneys, destroyed
in the liver, or eliminated from the body through the lungs. So rest
repaires fatigue.[1]

[Footnote 1: Goldmark, J.: _Fatigue and Efficiency_, p. 13.]

In physical activity, therefore, periods of lessened activ