    | as the experimental testing of a hypothesis, I was
     | not thinking of  experimentation in the narrow sense
     | in which it is confined to cases in which we ourselves
     | deliberately create the peculiar conditions under which we
     | desire to study a phenomenon.  I mean to extend it to every
     | case in which, having ascertained by deduction that a theory
     | would lead us to anticipate under certain circumstances phenomena
     | contrary to what we should expect if the theory were