Transcriber's Note: This book was published in 1800 and contains some inconsistent spelling, capitalization, hyphenation, and punctuation typical of that era. These have been retained as they appear in the original, including the inconsistent use of a period after the pound symbol (e.g., £.100 and £100). Inconsistent italicizing of l., s., and d. has been normalized to italics. Long-s (ſ) has been normalized to s. Printer errors have been resolved with reference to a later and apparently corrected printing of the same edition, available at the Internet Archive, http://www.archive.org/details/atreatiseonpoli03colqgoog. Unresolved printer errors are indicated with red dotted underlining; hover the mouse over the underlined text to see a Transcriber's Note. A [list] of these notes also appears at the end of this e-book.