The Contents.

Ch. 6 . Concerning the Wheel.

Ch. 7. Concerning the Pulley.

Ch. 8. Of the Wedg.

Ch. 9. Of the Screw.

Ch. 1 c. An inquiry into the magnificentworks of the Ancients,which muchex-feeding our later times may seem to in-fer a decay in these Mechanical arts .

Ch. 11 . That th$ Ancient shad diver mo-tives and means for such vafi magni-ficent works , which we have not.

Ch. 12 . Concerning the force of the Me-chanicsacuities yf articular ly, the Bal-lance and Leaver. How they may becontrived to move the whole world , orany other conceivable weight.

Ch. 13. Of the Wheel, by multiplicationof which , it is eafie to move any imagi-nable weight.

Ch. 14.