M. Vitruvii ... De architectura libri decem, ad Augustum Caesarem accuratiss. conscripti

CHAPTERS OF THE EIGHTH BOOK.

ON the discovery of water. Chapter I.
On rainwater. Chapter II.
On hot waters and what powers they have, coming from diverse metals, and on the nature of various springs, rivers, and lakes. Chapter III.
On the property of certain locations and springs also. Chapter IV.
On experiments with water. Chapter V.
On the leading and leveling of water, and instruments for this use. Chapter VI.
In how many ways water may be led. Chapter VII.

CHAPTERS OF THE NINTH BOOK.

PLATO’S invention concerning land-measuring. Chapter I.
On the square, a Pythagorean invention, from the deformation of an orthogonal triangle. Chapter II.
How a portion of silver mixed with gold can be detected and discerned in a finished work. Chapter III.
On gnomonic methods discovered from the rays of the sun through a shadow, and on the world and the planets. Chapter IV.
On the course of the sun through the twelve signs. Chapter V.
On the stars which are from the zodiac to the north. Chapter VI.
On the stars which are from the zodiac to the south. Chapter VII.
On the methods of clocks, and the shadows of gnomons at the time of the equinox, in Rome and in some other places. Chapter VIII.
On the method and use of clocks, and their invention, and by which inventors. Chapter IX.

CHAPTERS OF THE TENTH BOOK.

ON what a machine is, and its difference from an instrument, its origin and necessity. Chapter I.
On traction machines for sacred buildings and public works. Chapter II.
On diverse