Lex Parliamentaria; or, A treatise of the law and custom of the Parliaments of England, was a pocket manual for members of theParliament of England first published in 1690. It was originally attributed toGeorge Petyt. However, an attribution to IrishmanGeorge Philips seems now to be widely accepted, including by the historians SirJames Ware andWalter Harris.Thomas Jefferson praised the book in a letter to his son-in-law, opining, "For parliamentary knowledge theLex parliamentaria is the best book."[2] Its American counterparts are Jefferson's own 1801Manual of Parliamentary Practice andLex Parliamentaria Americana byLuther Stearns Cushing. The termlex parliamentaria is also sometimes used to describeparliamentary law in general.
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