Leonardo da Vinci's Treatise on Painting to be put up for sale

Leonardo da Vinci's Treatise on Painting, created between 1638 and 1641 in the workshop of Italian scholar Cassiano dal Pozzo, will be auctioned off. The manuscript is well-preserved and consists of 375 chapters with 56 ink illustrations. Sotheby's experts have valued the collection at $120-180 thousand.