His ideal city integrated a series of connected canals, which would be used for commercial purposes and as a sewage system. The city would feature lower and upper areas – the lower being canals for tradesmen and travelers and the upper being roads for “gentleman”.
According to Leonardo’s preview in the accompanying text, written in mirror writing it was made as a study of the proportions of the (male) human body as described in Vitruvius’ De architectura 3.1.2–3, which reads: “For the human body is so designed by nature that the face, from the chin to the top of the forehead and the lowest roots of the hair, is a tenth part of the whole height; the open hand from the wrist to the tip of the middle finger is just the same; the head from the chin to the crown is an eighth, and with the neck and shoulder from the top of the breast to the lowest roots of the hair is a sixth; from the middle of the breast to the summit of the crown is a fourth”.
The Anatomical Manuscript B is kept at the Royal Library at Windsor Castle. In it he made a number of pen-and-ink drawings recording his observations while dissecting an old man who had died in a hospital in Florence in the winter of 1507-08
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