THE 



ECONOMY OF*NATURE 



EXPLAINED AND ILLUSTRATED 



ON THE 



PRINCIPLES 



O F 



MODERN PHILOSOPHY. 



B V 



G. G R E G O R Y, D.'D. 



AUTHOR OF 



SSJTS HISTORICAL AND MORAL, &c. 



IN THREE VOLUMES. 

 WITH FIFTY-SIX PLATES. 



The. SECOND EDITION, with confidcrable Additions. 



VOL. I. 



LONDON: 



*INTED FOR J. JOHNSON* N 72, ST. *AUL*S HUEC TARP. 



