(WOLFF, Christian, Freiherr von). ~ Psychologie ou traité sur l’âme, contenant les connoissances, que nous en donne l’experience. Amsterdam: Pierre Mortier, 1745.
12mo (172 × 100 mm), pp. , 339,  (errata), title in red and black, engraved title vignette, woodcut ornaments. Contemporary marbled calf, spine gilt, slightly rubbed, with slight loss at head of spine. Early inscription to title (Chateau de Vincennes). A very good copy.
First edition of this anonymous translation (or more properly précis) from Wolff’s Psychologia empirica (1732) and Psychologia rationalis (1734). A key thinker of the Enlightenment, Wolff had divided psychology into these two distinct fields: the first regarded the soul as an immaterial substance about which it could only deduce rational concepts; he second regarded the soul as matter.