  Given a smooth, closed, oriented 4-manifold X and alpha in H_2(X,Z) such that
alpha.alpha > 0, a closed 2-form w is constructed, Poincare dual to alpha,
which is symplectic on the complement of a finite set of unknotted circles. The
number of circles, counted with sign, is given by d = (c_1(s)^2 -3sigma(X)
-2chi(X))/4, where s is a certain spin^C structure naturally associated to w.
