The great use of studying our predecessors is, to open the mind, to shorten our labour, and to give us the result of the selection made by those great minds of what is grand or beautiful in nature; her rich stores are all spread out before us; but it is an art, and no easy art, to know how or what to choose, and how to attain and secure the object of our choice. Thus, the highest beauty of form must be taken from nature; but it is an art of long deduction and great experience to know how to find it. We must not content ourselves with merely admiring and relishing; we must enter into the principles on which the work is wrought: these do not swim on the superficies, and consequently are not open to superficial observers. Art in its perfection is not ostentatious; it lies hid and works its effect, itself unseen. It is the proper study and labour of an artist to uncover and find out the latent cause of conspicuous beauties, and from thence form principles of his own conduct: such an examination is a continual exertion of the mind; as great, perhaps, as that of the artist whose works he is thus studying. The sagacious imitator does not content himself with merely remarking what distinguishes the different manner or genius of each master; he enters into the contrivance in the composition, how the masses of lights are disposed, the means by which the effect is produced, how artfully some parts are lost in the ground, others boldly relieved, and how all these are mutually altered and interchanged according to the reason and scheme of the work. He admires not the harmony of colouring alone, but examines by what artifice one colour is a foil to its neighbour. He looks close into the tints, examines of what colours they are composed, till he has formed clear and distinct ideas, and has learnt to see in what harmony and good colouring consists. What is learnt in this manner from the works of others becomes really our own, sinks deep, and is never forgotten; nay, it is by seizing on this clue that we proceed forward, and get further and further in enlarging the principles and improving the practice of our art. There can be no doubt but the art is better learnt from the works themselves, than from the precepts which are formed upon those works; but if it is difficult to choose proper models for imitation, it requires no less circumspection to separate and distinguish what in those models we ought to imitate. I cannot avoid mentioning here, though it is not my intention at present to enter into the art and method of study, an error which students are too apt to fall into. He that is forming himself must look with great caution and wariness on those peculiarities, or prominent parts, which at first force themselves upon view; and are the marks, or what is commonly called the manner, by which that individual artist is distinguished. Peculiar marks I hold to be, generally, if not always, defects; however difficult it may be wholly to escape them.