same unbroken chain of being, if we regard him simply as a new species—a member of the animal kingdom—subject, like other species, to certain fixed and invariable laws, and adapted like them to the state of the animate and inanimate world prevailing at the time of his creation. Physically considered, he may form part of an indefinite series of terrestrial changes past, present, and to come; but morally and intellectually he may belong to another system of things—of things immaterial—a system which is not permitted to interrupt or disturb the course of the material world, or the laws which govern its changes.[xxii-B]