Bernard Williams Consequentialism and Integrity

Bernard Williams Consequentialism and Integrity 
In “Consequentialism and Integrity,” Bernard Williams discusses a case involving a
chemist named George. Briefly recount the important details of the case. According to
Williams, what would an Act Utilitarian say George should do? What does Williams mean
when he says that Act Utilitarianism entails a “strong doctrine of negative responsibility,”
and how does George’s case illustrate this point? What do you think George should do,
and why?