THE ECONOMY OF NATURE EXPLAINED AND ILLUSTRATED ON THE PRINCIPLES Ог MODERN PHILOSOPHY. BY G. GREGORY, D. D. AUTHOR OF ESSAYS HISTORICAL AND MORAL, &c. IN THREE VOLUMES. WITH FIFTY-SIX PLATES. The SECOND EDITION, with confiderable Additions, VOL. II. LONDON: PRINTED FOR J. JOHNSON, N° 72, ST. PAUL'S CHURCH YARD, 1798. |