  Differences between the properties of gluon and quark jets have been
convincingly established by experiments at LEP. Quantitative tests of QCD
analytic predictions for these differences have not been possible, however,
because of differences between the theoretical and experimental definitions of
the jets and event samples. Here, a new method to compare gluon and quark jet
properties is described, which uses an inclusive definition of the jets in
analogy to theoretical calculations. Using this new method, a value
1.552+-0.041(stat.)+-0.061(syst.) is found for the ratio of the mean charged
particle multiplicity in gluon jets to that in quark jets, in agreement with a
recent analytic calculation which incorporates energy conservation.
