 Collins deals in passing with determinism and freedom of the will in the 1707–08 correspondence with Samuel Clarke and in his 1707 book An Essay concerning the Use of Reason. His A Philosophical Inquiry Concerning Liberty of 1717 is entirely devoted to the issue. From the beginning, Collins is a determinist with a compatibilist account of free action (Clarke 1738 [1928: 872]; Clarke and Collins: 226–227). Clarke attacked Collins’ determinism in the 1707–08 correspondence. He also reviewed the 1717 book and defended a doctrine of libertarian free will as he had in the earlier correspondence.