 David Hull ended his book, Science as a Process (1988), with the remark that the book can be regarded as an attempt to fulfill both Kuhn’s and Toulmin’s ambitions to provide a evolutionary account of scientific development. Hull’s is the most thoroughgoing attempt to date to provide an evolutionary account of scientific practice, at least in a specific field. However, nothing like Kuhnian paradigms, normal science, and revolutions are to be found in Hull’s book, and this was deliberate on his part. Whereas Kuhn originally said that paradigms correspond one-to-one with scientific communities, Hull rejected Kuhn’s idea of a scientific community as too loose. A scientific community, he said, does not consist of people who merely happen to agree on certain things (anymore than the members of a species are individuals who happen to share a set of traits). Mere consensus is not enough. Rather, communities are tightly causally linked in the right sorts of ways, just as species are. There is no community of biologists or even of evolutionary biologists but only a patchwork of cliques. It is here, locally, that the seeds of innovation are sown, most of which are weeded out in a selective process by the larger group of specialists. Hull’s is a story of the socio-cultural evolution of science without revolution.