138 THE FACTORS OF THE MIND

bits in the interest of a quantitative technique' : yet
that is no reason for consigning all scores to the fire.
Provided factor-analysis tells the truth and nothing but the
truth, we need not condemn it for failing to tell the whole
truth.

Finally, let me insist that measurement is a means and
not an end. Measurement is not the goal towards which
classification has been groping ; nor is classification an out-
of-date substitute for quantitative measurement. In com-
plex biological subjects, such figures, whatever be their
function elsewhere, are merely a device for making our
efforts at systematic classification more rigorous and more
precise.