Leonardo da Vinci, the Florentine artist, scientist, and inventor, was born at Vinci in Tuscany, the natural son of a notary, and died near Amboise, France. At his death he left a sizable collection of notebooks that were subsequently scattered in the various libraries of Europe. From 1881 on, many of these notebooks have been published. They consist of notes and jottings on various topics: mechanics, physics, anatomy, physiology, literature, and philosophy. They contain, moreover, plans and designs for machines that frequently have suggested Leonardo's "precursive genius." There are machines of war and of peace, flying machines based on the flight of birds, a parachute, a helicopter, tools and gadgets of all kinds. Leonardo's notebooks are also full of methodological notations on the procedures of scientific inquiry and philosophical considerations about the processes of nature. Undoubtedly many of the arguments that he discussed...