Foreword by Maro K. Papathanasiou , Emeritus Professor of the Department of Mathematics of the University of Athens.

"The seventh book deals with works of Euclid and Apollonius that are not preserved today. So important are Pappos ' comments on them, that one of them immediately influenced Descartes ' thinking and thus understood a large part of his "Geometry". Finally, the eighth book, which will be published in the fourth and final volume, deals with mechanical issues (center of gravity, inclined plane, toothed wheels, wheel axle, lever, pulley, wedge and screw)." (From the foreword of the book.)