Physical effects of instantons -- Some aspects of instantons -- The interpretation of Higgs fields as Yang Mills fields -- Topological and phenomenological aspects of gravity and supergravity -- Bifurcation and stability in Yang-Mills theory with sources -- On the long-range interaction of topologically charged monopoles -- Interaction of superconducting vortices -- On groups of gauge transformations -- Construction of gauge fields from initial data -- Some solutions of the Einstein-Yang-Mills equations -- Some invariant solutions to the Yang-Mills equations in the presence of scalar fields in Minkowski space -- Graded Riemannian geometry and graded fibre bundles, a context for local super-gauge theories -- Metric and connection theories of gravity: The gauge theories of spacetime symmetry.