Wikipedia
A parson-naturalist was a cleric (a " parson", strictly defined as a country priest who held the living of a parish, but the term is generally extended to other clergy), who often saw the study of natural science as an extension of his religious work. The philosophy entailed the belief that God, as the creator of all things, wanted man to understand his creations and thus to study them by collecting and classifying organisms and other natural phenomena.
The natural theologians John Ray (1627–1705) and William Paley (1743–1805) argued that the elaborate complexity of the world of nature was evidence for the existence of a creator. Accordingly, a parson-naturalist frequently made use of his insights into philosophy and theology when interpreting what he observed in natural history.