``The study of physiology is as repugnant to the psychologist as
that of acoustics to the composer,'' no longer holds. We are not
poets, we are investigators. If we are to do our work properly, we
must base it completely upon modern psycho physical fundamentals.
Whoever expects unaided to find the right thing at the right moment
is in the position of the individual who didn't know whether he could
play the violin because he had not yet tried. We must gather
wisdom while we are not required to use it; when the time for
use arrives, the time for harvest is over.

Let this be our fundamental principle: _That we criminalists
receive from our main source, the witnesses, many more inferences
than observations_, and that this fact is the basis of so many mistakes
in our work. Again and again we are taught, in the deposition of
evidence, that only facts as plain sense-perceptions should be presented;
that inference is the judge's affair. But we only appear
to obey this principle; actually, most of what we note as fact
and sense-perception, is nothing but a more or less justified
judgment, which though presented in the honestest belief, still

offers no positive truth. ``Amicus Plato, sed magis amica
Veritas.''

There is no doubt that there is an increasing, and for us jurists,
a not unimportant demand for the study of psychology in its bearing
on our profession. But it must be served. The spirited Abb
de Bats, said at a meeting of criminalists in Brussels, that the
_present tendency of the science of criminal law demands the observation
of the facts of the daily life_. In this observation consists the alpha
and omega of our work; we can perform it only with the flux of