Rosa da Tivoli acquired a wonderful facility in design and execution, for which reason he was named Mercurius by the Bentvogel Society. A remarkable instance of his powers is recorded by C. le Blond, then a student at Rome. "It happened one day," says he, "that several young artists and myself were occupied in designing from the bassi-relievi of the Arch of Titus, when Roos passing by, was particularly struck with some picturesque object which caught his attention, and he requested one of the students to accommodate him with a crayon and paper. What was our surprise, when in half an hour he produced an admirable drawing, finished with accuracy and spirit."
It is also related that the Imperial Ambassador, Count Martinez, laid a wager with a Swedish general that Roos would paint a picture of three-quarters' size, while they were playing a game at cards; and in less than half an hour the picture was well finished, though it consisted of a landscape, a shepherd, and several sheep and goats.
ROSA DA TIVOLI'S HABITS.
Rosa da Tivoli unfortunately fell into extravagant and dissipated habits, which frequently caused him great inconvenience. From his facility, he multiplied his pictures to such an extent as greatly to depreciate their value. It is related that he would sit down, when pressed for money, dispatch a large picture in a few hours, and send it directly to be sold at any price. His servant, possessing more discretion than his master, usually paid him the highest price offered by the dealers, and kept the pictures himself, till he could dispose of them to more advantage.
LUCA CAMBIASO'S FACILITY IN PAINTING.
The most remarkable quality of this distinguished Genoese painter was his rapidity of operation. He began to paint when ten years old, under the eye of his father, Giovanni Cambiaso, who evinced good taste in setting him to copy some works by the correct and noble Mantegna. His progress was so rapid that at the age of seventeen he was entrusted to decorate some façades and chambers of the Doria palace at Genoa, where he displayed his rash facility of hand by painting the story of Niobe on a space of wall fifty palms long and of proportionate height, without cartoons or any drawing larger than his first hasty sketch on a single sheet of paper! While he was engaged on this work, there came one morning some Florentine artists to look at it. Seeing a lad enter soon after, and commence painting with prodigious fury, they called out to him to desist; but his mode of handling the brushes and colors, which they had imagined it was his business merely to clean or pound, soon convinced them that this daring youngster was no other than Luca himself; whereupon they crossed themselves, and declared he would one day eclipse Michael Angelo.