What are the motifs in Science and the Enlightenment by Thomas L. Hankins?

Naturalism was an important component and development of the Enlightenment, though their naturalism was considerably different form modern naturalism. Naturalism in the Enlightenment meant an interest in the functioning of the natural world, primarily an interest in the functioning of specific phenomena. This may seem odd, after all, what else would they be studying if not the natural world?