 Meinong considers ethics, aesthetics and logic to be the primary disciplines of practical philosophy. It is worth noting that he contrasts his customary use of “logic” as a practical discipline, which was adopted from Brentano and is comparable to Port-Royal Logic, with Kant’s and, especially, Husserl’s conception of a “formal” or “pure” logic and also with symbolic logic, “Logistik”, and algebra of logic, which all can be seen as parts of his theory of objects. He puts the distinction between theoretical and practical disciplines primarily down to the difference between theoretical and practical interests and not to the difference between the subject matters of the sciences. In contrast to the disciplines of theoretical philosophy — metaphysics, object theory, and theory of knowledge, for example —, which are determined by cognitive aims, the practical disciplines set themselves practical goals. They can be seen as something like applied sciences or branches of engineering [Kunstlehren], quite comparable to architecture, and nautical or military sciences. (1885: 96–98; 1904b, §§7–8; 1907, §20: 114–30; 1921a: 103, 130.)