  Let $X$ be a smooth, closed, connected, orientable four-manifold with
$b^1(X)=0$ and $b^+(X)\geq 3$ and odd. We show that if $X$ has Seiberg-Witten
simple type, then the SO(3)-monopole cobordism formula of Feehan and Leness
(2002) implies Witten's Conjecture relating the Donaldson and Seiberg-Witten
invariants.
