The NoteBooks of Leonardo da Vinci reveal a true Renaissance man, whose habit of rigorous enquiry, observation, and experiment, grounded in a philosophic system, led him to conceive of the universe as an organized cosmos corresponding to a work of art. The scope of his interests and the amount of detail that he undertook with them is revealed here to show a man who could quite clearly be labelled a genius. [Publisher Note: This eBook does not contain images--sketches are described within the text.]