  We have extended our earlier simulations of the high temperature behaviour of
lattice QCD with two light flavours of staggered quarks on a $16^3 \times 8$
lattice to lower quark mass (m_q=0.00625). The transition from hadronic matter
to a quark-gluon plasma is observed at $6/g^2=5.49(2)$ corresponding to a
temperature of $T_c \approx 140$MeV. We present measurements of observables
which probe the nature of the quark-gluon plasma and serve to distinguish it
from hadronic matter. Although the transition is quite abrupt, we have seen no
indications that it is first order.
