A SYSTEM OF MECHANICAL PHILOSOPHY. By JOHN ROBISON, LL. D. LATE PROFESSOR OF NATURAL PHILOSOPHY IN THE UNIVERSITY OF F.DINBURGH. WITH NOTES, By DAVID BREWSTER, LL. 1). ♦ FELLOW OF THE ROYAL SOCIETY OF LONDON, AND SECRETARY TO THE ROYAL 90CIETY OF EDINBURGH. IN FOUR VOLUMES, AND A VOLUME OF PLATES. VOL. IV. EDINBURGH: PRINTED FOR JOHN MURRAY', LONDON. 1822.