A TREATISE; SHEWING THE NATURE and BENEFIT OF THAT IMPORTANT SCIENCE, AND The Way to attain it. INTERMIXED WITH Various Reflections and Obfervations By JOHN MASON, A. M. è Cœlo defcendit grab saulor. Juv. THE EIGHTH EDITION. DUBLIN: Printed by WILLIAM SLEATER, on Cork-Hill, M DCC LXVII.. то SAMUEL LESINGHAM, Efq; Treasurer of St. Thomas's Hofpital. SIR, CODESTY and felf-diffidence are the allowed characteristics M of Self-Knowledge. Hence, if my prefuming to addrefs this piece to you fhould discover more selfconfidence than becomes a true acquaintance with the fubject I write upon, I have only to declare that your known uprightness and condefcenfion have encouraged that prefumption: for this address cannot be more highly animated, than by |