Apelles,[94] of Cos, surpassed all the other painters who either preceded or succeeded him. Single-handed, he contributed more to painting than all the others together, and even went so far as to publish some treatises on the principles of the art. The great point of artistic merit with him was his singular charm of gracefulness, and this too, tho the greatest of painters were his contemporaries. In admiring their works and bestowing high eulogiums upon them, he used to say that there was still wanting in them that equal of beauty so peculiar to himself, and known to the Greeks as "Charis"; others, he said, had acquired all the other requisites of perfection, but in this one point he himself had no equal. He also asserted his claim to another great point of merit; admiring a picture by Protogenes, which bore evident marks of unbounded laboriousness and the most minute finish, he remarked that in every respect Protogenes was fully his equal, or perhaps his superior, except in this, that he himself knew when to take his hand off a picture--a memorable lesson, which teaches us that over-carefulness may be productive of bad results. His candor, too, was equal to his talent; he acknowledged the superiority of Melanthius[95] in his grouping, and of Asclepiodorus in the niceness of his measurements, or in other words, the distances that ought to be left between the objects represented. A circumstance that happened to him in connection with Protogenes[96] is worthy of notice. The latter was living at Rhodes, when Apelles disembarked there, desirous of seeing the works of a man whom he had hitherto only known by reputation. Accordingly, he repaired at once to the studio; Protogenes was not at home, but there happened to be a large panel upon the easel ready for painting, with an old woman who was left in charge. To his inquiries she made answer that Protogenes was not at home; and then asked whom she should name as the visitor. "Here he is," was the reply of Apelles; and seizing a brush, he traced with color upon the panel an outline of a singularly minute fineness. Upon his return the old woman mentioned to Protogenes what had happened. The artist, it is said, upon remarking the delicacy of the touch, instantly exclaimed that Apelles must have been the visitor, for that no other person was capable of executing anything so exquisitely perfect. So saying, he traced within the same outline a still finer outline, but with another color; and then took his departure, with instructions to the woman to show it to the stranger if he returned, and to let him know that this was the person whom he had come to see.