If we turn our eyes to the several Schools of Painting, and consider their respective excellencies, we shall find that those who excel most in colouring pursued this method. The Venetian and Flemish schools, which owe much of their fame to colouring, have enriched the cabinets of the collectors of drawings with very few examples. Those of Titian, Paul Veronese, Tintoret, and the Bassans, are in general slight and undetermined. Their sketches on paper are as rude as their pictures are excellent in regard to harmony of colouring. Correggio and Baroccio have left few, if any, finished drawings behind them. And in the Flemish school, Rubens and Vandyck made their designs for the most part either in colours or in chiaro-oscuro. It is as common to find studies of the Venetian and Flemish Painters on canvas as of the schools of Rome and Florence on paper. Not but that many finished drawings are sold under the names of those masters. Those, however, are undoubtedly the productions either of engravers or their scholars, who copied their works. These instructions I have ventured to offer from my own experience; but as they deviate widely from received opinions, I offer them with diffidence, and when better are suggested shall retract them without regret. There is one precept, however, in which I shall only be opposed by the vain, the ignorant, and the idle. I am not afraid that I shall repeat it too often. You must have no dependence on your own genius. If you have great talents, industry will improve them: if you have but moderate abilities, industry will supply their deficiency. Nothing is denied to well-directed labour: nothing is to be obtained without it. Not to enter into metaphysical discussions on the nature or essence of genius, I will venture to assert, that assiduity unabated by difficulty, and a disposition eagerly directed to the object of its pursuit, will produce effects similar to those which some call the result of _natural powers_. Though a man cannot at all times, and in all places, paint or draw, yet the mind can prepare itself by laying in proper materials, at all times, and in all places. Both Livy and Plutarch, in describing Philopoemen, one of the ablest generals of antiquity, have given us a striking picture of a mind always intent on its profession, and by assiduity obtaining those excellencies which some all their lives vainly expect from nature. I shall quote the passage in Livy at length, as it runs parallel with the practice I would recommend to the Painter, Sculptor, and Architect:--