There has been a world of discussion on this subject, but there can be no doubt that John van Eyck, called John of Bruges, and by the Italians, Giovanni da Bruggia, and Gio. Abeyk or Eyck, is entitled to the honor of the invention of Oil Painting as applied to pictures, though Mr. Raspe, the celebrated antiquary, in his treatise on the invention of Oil Painting, has satisfactorily proved that Oil Painting was practised in Italy as early as the 11th century, but only as a means of protecting metalic substances from rust. According to van Mander, the method of painting in Flanders previous to the time of the van Eycks, was with gums, or a preparation called egg-water, to which a kind of varnish was afterwards applied in finishing, which required a certain degree of heat to dry. John van Eyck having worked a long time on a picture and finished it with great care, placed it in the sun-shine to dry, when the board on which it was painted split and spoiled the work. His disappointment at seeing so much labor lost, urged him to attempt the discovery, by his knowledge of chemistry, of some process which would not in future expose him to such an unfortunate accident. In his researches, he discovered the use of linseed and nut oil, which he found most siccative. This is generally believed to have happened about 1410. There is however, a great deal of contradiction among writers as to the van Eycks, no two writers being found to agree. Some assert that John van Eyck introduced his invention both into Italy and Spain, while others declare that he never left his own country, which would seem to be true. Vasari, the first writer on Italian art, awards the invention to Giovanni da Bruggia, and gives an account of its first introduction into Italy by Antonello da Messina, as we shall presently see. But Dominici asserts that oil painting was known and practised at Naples by artists whose names had been forgotten long before the time of van Eyck. Many other Italian writers have engaged in the controversy, and cited many instances of pictures which they supposed to have been painted in oil at Milan, Pisa, Naples, and elsewhere, as early as the 13th, 12th, and even the 9th centuries. But to proceed with the brothers van Eyck, John and Hubert--they generally painted in concert till the death of Hubert, and executed many works in oil, which were held in the highest estimation at the time when they flourished. Their most important work was an altar-piece, with folding doors, painted for Jodocus Vyts, who placed it in the church of St. Bavon at Ghent. The principal picture in this curious production represents the Adoration of the Lamb as described by St. John in the Revelations. On one of the folding doors is represented Adam and Eve, and on the other, St. Cecilia. This extraordinary work contains over three hundred figures, and is finished with the greatest care and exactness. It was formerly in the Louvre, but it is now unfortunately