Abstract

George Berkeley's Siris (1744) has been a neglected work, for many reasons. Some of them are good and some bad. The book is difficult to decipher, mainly because of its ancient metaphysics. He talks about the world as an animal or plant. He speculates about man as a microcosm which is analogous to the universe as a macrocosm. He recommends tar-water as a universal medicine. This was understandable in his own time. But Siris is also a Newtonian treatise which both criticizes and develops important physical and chemical theories. Berkeley's own contribution is formulated in terms of light and fire. I study these arguments in detail. It is also clear that Siris is no longer an immaterialist treatise. The doctrine of ideas is not so important to him any more. However, he never changed his doctrine of causality. I analyze several versions of it. This looks like his lasting main contribution to the philosophy of science. And causality is also theologically crucial, as I try to show. We must keep in mind the fact that Berkeley might have been interesting in the contemporary science, but he insisted that science must ultimately be ruled by religion. Science is never an autonomous or sovereign field of human enterprise.