The various senses or powers of perception,[25] from which the human mind derives all its simple ideas, were, according to this system, of two different kinds, of which the one were called the direct or antecedent, the other, the reflex or consequent senses. The direct senses were those faculties from which the mind derived the perception of such species of things as did not presuppose the antecedent perception of any other. Thus sounds and colours were objects of the direct senses. To hear a sound or to see a colour does not presuppose the antecedent perception of any other quality or object. The reflex or consequent senses, on the other hand, were those faculties from which the mind derived the perception of such species of things as presupposed the antecedent perception of some other. Thus harmony and beauty were objects of the reflex senses. In order to perceive the harmony of a sound, or the beauty of a colour, we must first perceive the sound or the colour. The moral sense was considered as a faculty of this kind. That faculty, which Mr. Locke calls reflection, and from which he derived the simple ideas of the different passions and emotions of the human mind, was, according to Dr. Hutcheson, a direct internal sense. That faculty again by which we perceived the beauty or deformity, the virtue or vice of those different passions and emotions, was a reflex, internal sense. Footnote 25: Treatise of the passions. Dr. Hutcheson endeavoured still further to support this doctrine, by shewing that it was agreeable to the analogy of nature, and that the mind was endowed with a variety of other reflex senses exactly similar to the moral sense; such as a sense of beauty and deformity in external objects; a public sense, by which we sympathize with the happiness or misery of our fellow-creatures; a sense of shame and honour, and a sense of ridicule.