Having begun his celebrated “Treatise on Painting” and recommenced his work on the colossal equestrian statue of Francesco Sforza, which at the moment of its destruction by the French bowmen in 1500 had earned him lasting fame as a sculptor, Leonardo undertook his _chef d’œuvre_, _The Last Supper_, at Milan. Executed in tempera on a badly prepared stucco ground, the painting unfortunately soon began to perish, and although it was restored in 1908 with great success by Professor Cavenaghi, only a faint idea of its pristine beauty remains. The Louvre possesses a contemporary copy (No. 1603A) of this fresco by Marco d’Oggiono, which was commissioned by the Constable de Montmorency and long hung in the Château d’Ecouen. A similar copy of Leonardo’s _Last Supper_ was purchased from a grocer in Milan in 1793 for £600, and is now in the Royal Academy, London. MONA LISA When Lodovico Sforza was conquered by the French and his city occupied by them, Leonardo set out for Mantua and Florence. It may have been in the spring or summer of 1500 that he began to work on the _Portrait of Mona Lisa_ (No. 1601, Plate IV.) which officially passes under the title of _La Joconde_. Vasari says that Leonardo worked on this picture for four years, and finally left it unfinished. The words of Vasari must not be taken too literally. We know, in fact, that Leonardo did not work in Florence for four consecutive years during the period to which the Louvre’s treasured picture belongs, but in 1502 visited Orvieto, Pœsaro, and Rimini, acting as engineer to Cesare Borgia. He probably began it in 1500, resumed work on it in 1503, and did not complete it until the following year. This would make Vasari’s statement substantially correct. The subject of this world-famous portrait was Lisa di Anton Maria di Noldo Gherardini, the third wife of Francesco di Bartolommeo de Zenobi del Giocondo, whom she married in 1495. It is from the surname of her husband that she derives the name of “_La Joconde_” by which her portrait is now officially known. (The title has nothing to do with any reference to her jocund outlook on life.) A French critic has shown that Mona Lisa’s child died while this portrait was being painted. “Whoever shall desire to see how far Art can imitate Nature,” says Vasari, “may do so to perfection in this head, wherein every peculiarity that could be depicted by the utmost subtlety of the pencil has been faithfully reproduced. The eyes have the lustrous brightness and moisture which is seen in life, and around them are those pale, red, and slightly livid circles also proper to Nature. The nose, with its beautiful and delicately roseate nostrils, might be easily believed to be alive; the mouth, admirable in its outline, has the lips uniting the rose tints of their colour with those of the face, in the utmost perfection, and the carnation of the cheek does not appear to be painted, but truly flesh and blood.” This