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20 I suspect that many of his experiments were tried for purely practical ends. And it sometimes saddens me to think that the man who left us the "Adoration of the Magi" is famous also for the canals of Lombardy.

Such criticism may lead the reader to think that I am incapable of appreciating versatility. Had I the time, I might answer that the problem is really one of quantity and quality. It is not the number of things that a man has done that matters, but their excellence. I could wish that Leonardo had painted one more canvas and left a hundred less precepts; and I could indeed willingly dispense with that praise of his universality which is so showered upon him by men who do not realize the meaning of their words. Botanists and engineers of our own day can draw plants and plans of fortresses; but for the painting of certain mountainous backgrounds and for the writing of certain pensées there has been none save Leonardo—and it is sad to think that so much of his time was spent on things unworthy of his powers.

So too I regret the excessive time he spent in companionship with other men, and the hours that he wasted in the courts of Milan and of France at repartee with ladies and with princes. He was delightful in conversation—so the historians say—and those ambiguous prophecies of