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First edition of Galileo's last and perhaps greatest work. "Two New Sciences underlines modern physics not only because it contains the elements of the mathematical treatment of motion, but also because most of the problems that came rather quickly to be seen as problems amenable to physical experiment and mathematical analysis were gathered together in this book with suggestive discussions of their possible solution" (DSB). Galileo sought and found general principles in the motion of falling bodies, projectiles and the pendulum. The concept of mass was implied by his conviction that in a vacuum all bodies would fall with the same acceleration. Galileo had begun a new era in the science of mechanics. "It was upon his foundations that Huygens, Newton and others were able to erect the frame of the science of dynamics, and to extend its range (with the concept of universal gravitation) to the heavenly bodies" (PMM). Fine copy.