  We analyze the topological and fermionic vacuum structure of four-dimensional
QCD on the lattice by means of correlators of fermionic observables and
topological densities. We show the existence of strong local correlations
between the topological charge and monopole density on the one side and the
quark condensate, charge and chiral density on the other side. Visualization of
individual gauge configurations demonstrates that instantons (antiinstantons)
carry positive (negative) chirality, whereas the quark charge density
fluctuates in sign within instantons.
