Not with all of them; for those which belong properly to spiritual substances, or properly to corporeal substances, call for special treatment in Psychology and Cosmology respectively. In the main, only such species of accidents as are common to matter and spirit alike, will form the subject of the remaining portion of the present volume. Only the broader aspects of such categories as Quality, Quantity and Causality—aspects which have a more direct bearing on the Theory of Being and the Theory of Knowledge in general,—call for treatment in General Metaphysics. A more detailed treatment must be sought in other departments of Philosophy. 77. NATURE OF THE ACCIDENT CALLED QUALITY.—In the widest sense of the term, _Quality_ is synonymous with _logical attribute_. In this sense whatever can be predicated of a subject, whatever _logically_ determines a subject in any way for our thought is a quality or “attribute” of that subject. In a sense almost equally wide the term is used to designate any _real_ determination, whether substantial or accidental, of a subject. In this sense the differential element, or _differentia specifica_, determines the generic element, or genus, of a substance: it tells us what _kind_ or _species_ the substance is: _e.g._ what kind of animal a man is, _viz._ rational; what kind of living thing an animal is, _viz._ sentient; what kind of body or corporeal thing a plant is, _viz._ living. And hence scholastics have said of the predicable “_differentia specifica_” that it is predicated adjectivally, or as a _quality_, to tell us in _what the thing consists_, or what is its nature: differentia specifica praedicatur _in quale quid_: it gives us the determining principle of the specific nature. Or, again, quality is used synonymously with any _accidental_ determination of a substance. In this sense magnitude, location, action, etc., though they determine a subject in different accidental ways, nevertheless are all indiscriminately said to “qualify” it in the sense of determining it somehow or other, and are therefore called “qualities” in the wide sense of “accidents”. Hence, again, the scholastics have said that inasmuch as all accidents determine or qualify their subjects, they are predicated of these _qualitatively_, and may be called in a wide sense “qualifications” or “qualities”: omnia genera accidentium qualificant substantiam et praedicantur _in quale_.