In 1797, Schelling published the essay "Neue Deduction des Naturrechts" ("New Deduction of Natural Law"), which anticipated Fichte's treatment of the topic in "Grundlage des Naturrechts" ("Foundations of Natural Law"). His studies of physical science bore fruit in "Ideen zu einer Philosophie der Natur" ("Ideas Concerning a Philosophy of Nature", 1797), and the treatise "Von der Weltseele" ("On the World-Soul", 1798). In "Ideen" Schelling referred to Leibniz and quoted from his "Monadology". He held Leibniz in high regard because of his view of nature during his natural philosophy period.