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The Commentaries on the Laws of England are an influential 18th-century treatise on the common law of England by Sir William Blackstone, originally published by the Clarendon Press at Oxford, 1765–1770. The work is divided into four volumes, on the rights of persons, the rights of things, of private wrongs and of public wrongs.
The Commentaries were long regarded as the leading work on the development of English law and played a role in the development of the American legal system. They were in fact the first methodical treatise on the common law suitable for a lay readership since at least the Middle Ages. The common law of England has relied on precedent more than statute and codifications and has been far less amenable than the civil law, developed from the Roman law, to the needs of a treatise. The Commentaries were influential largely because they were in fact readable, and because they met a need.
The Commentaries are often quoted as the definitive pre-Revolutionary source of common law by United States courts. Opinions of the Supreme Court of the United States quote from Blackstone's work whenever they wish to engage in historical discussion that goes back that far, or farther (for example, when discussing the intent of the Framers of the Constitution). The book was famously used as the key in Benedict Arnold's book cipher, which he used to communicate secretly with his conspirator John André during their plot to betray the Continental Army during the American Revolution.
The Rights of Persons
The Rights of Persons is the first volume in the four part series that is the Commentaries. Divided into 18 chapters, it is largely concerned with the rights of individuals; the rights of Parliament; the rights and title of the King; the royal family; the councils belonging to the King; kingly duties; the royal prerogative; the King's revenue; subordinate magistrates; the people (aliens, denizens, and natives); the rights of the clergy; the civil state; the military and maritime states; the relationship between master and servant (in modern-day terminology, employer and employee), husband and wife, parent and child, guardian and ward; and finally corporates.
The Rights of Things
The Rights of Things, Blackstone's longest volume, deals with property. The vast majority of the text is devoted to real property, this being the most valuable sort in the feudal law upon which the English law of land was founded. Property in chattels was already beginning to overshadow property in land, but its law lacked the complex feudal background of the common law of land, and was not dealt with nearly as extensively by Blackstone.
Of Private Wrongs
Of Private Wrongs dealt with torts as they existed in Blackstone's time. The various methods of trial that existed at civil law were also dealt with in this volume, as were the jurisdictions of the several courts, from the lowest to the highest. Almost as an afterthought, Blackstone also adds a brief chapter on equity, the parallel legal system that existed in English law at the time, seeking to address wrongs that the common law did not handle.
Of Public Wrongs
Of Public Wrongs is Blackstone's treatise on criminal law. Here, Blackstone the apologist takes centre stage; he seeks to explain how the criminal laws of England were just and merciful, despite becoming later known as the Bloody Code for their severity. He does however accept that "It is a melancholy truth, that among the variety of actions which men are daily liable to commit, no less than an hundred and sixty have been declared by Act of Parliament to be felonious without benefit of clergy; or, in other words, to be worthy of instant death". Blackstone frequently resorted to assuring his reader that the laws as written were not always enforced, and that the King's power of pardon could be exercised to correct any hardships or injustices.
Blackstone for the first time made the common law readable and understandable by non-lawyers. At first, his Commentaries were hotly contested, some seeing in them an evil or covert attempt to reduce or codify the common law which was anathema to common law purists.
For decades, a study of the Commentaries was required reading for all first year law students. Lord Avonmore said of Blackstone: "He it was who first gave to the law the air of a science. He found it a skeleton and clothed it with life, colour and complexion. He embraced the cold statue and by his touch, it grew into youth, health and beauty." Jeremy Bentham, who had been a critic of the Commentaries when they were first published, credits Blackstone with having: "... taught jurisprudence to speak the language of the scholar and the gentleman; put a polish upon that rugged science, cleansed her from the dust and cobwebs of the office and, if he has not enriched her with that precision which is drawn only from the sterling treasury of the sciences, has decked her out to advantage from the toilet of classical erudition, enlivened her with metaphors and allusions and sent her abroad in some measure to instruct."
While there is much valuable historical information in the Commentaries, later historians have tended to be somewhat critical of the uses Blackstone made of history.  the easy and contradictory assurance that England's current political settlement represented the optimal state of rational and just government, while claiming simultaneously that this optimal state was an ideal that had always existed in the past, despite the many struggles in England's history between overreaching kings and wayward parliaments.
But Blackstone's chief contribution was to create a succinct, readable, and above all handy epitome of the common law tradition. While useful in England, Blackstone's text answered an urgent need in the developing United States and Canada. In the United States, the common law tradition was being spread into frontier areas, but it was not feasible for lawyers and judges to carry around the large libraries that contained the common law precedents. The four volumes of Blackstone put the gist of that tradition in portable form. They were required reading for most lawyers in the Colonies, and for many, they were the only reading. 
Two decades after their publication, Blackstone's Commentaries were the focus of a mocking polemic by Jeremy Bentham, called Fragment on Government. This dissection of Blackstone's first book made Bentham's name notorious, though it was originally published anonymously.
In 1841–45 Henry John Stephen published New Commentaries on the Laws of England (Partly Founded on Blackstone), whose structure was modelled on Blackstone's work and which liberally quoted from it; much of Blackstone's text remained as late as 1914 in the 16th edition of Stephen's Commentaries; in 1922 under Edward Jenks most of the text was rewritten but the structure was realigned more closely to Blackstone's original.
“Of great importance to the public is the preservation of this personal liberty; for if once it were left in the power of any the highest magistrate to imprison arbitrarily whomever he or his officers thought proper, (as in France it is daily practised by the crown,) there would soon be an end of all other rights and immunities. Some have thought that unjust attacks, even upon life or property, at the arbitrary will of the magistrate, are less dangerous to the commonwealth than such as are made upon the personal liberty of the subject. To bereave a man of life, or by violence to confiscate his estate, without accusation or trial, would be so gross and notorious an act of despotism, as must at once convey the alarm of tyranny throughout the whole kingdom; but confinement of the person, by secretly hurrying him to jail, where his sufferings are unknown or forgotten, is a less public, a less striking, and therefore a more dangerous engine of arbitrary government."
"[T]he principal aim of society is to protect individuals in the enjoyment of those absolute rights, which were vested in them by the immutable laws of nature, but which could not be preserved in peace without that mutual assistance and intercourse which is gained by the institution of friendly and social communities. Hence it follows, that the first and primary end of human laws is to maintain and regulate these absolute rights of individuals."
- "That the King can do no wrong, is a necessary and fundamental principle of the English constitution."
- "It is better that ten guilty persons escape than one innocent suffer."
- "There is nothing which so generally strikes the imagination, and engages the affections of mankind, as the right of property; or that sole and despotic dominion which one man claims and exercises over the external things of the world, in total exclusion of the right of any other individual in the universe. And yet there are very few, that will give themselves the trouble to consider the original and foundation of this right." (Commentaries, Book II Ch. I)
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- The Fifth Edition, Oxford, at the Clarendon Press, MDCCLXXIII., printed for William Strahan, Thomas Cadell, and Daniel Prince. 8vo., 4 vols.
- The Twelfth Edition (with portraits of the judges), with the last corrections of the author and with notes and additions by Edward Christian, Esq., Barrister at Law and Professor of the Laws of England in the University of Cambridge, London, 1793–1795. 4 vols., 8vo.
- Blackstone's Commentaries: with notes of reference, to the Constitution and laws, of the federal government of the United States, and of the Commonwealth of Virginia : in five volumes, with an appendix to each volume, containing short tracts upon such subjects as appeared necessary to form a connected view of the laws of Virginia, as a member of the federal union / by St. George Tucker.
- The Sixteenth Edition, with notes by J. F. Archbold, (added to Christian's), London, 1811. 4 vols., royal 8vo.
- The Sixteenth Edition, with notes by J. T. Coleridge, London, 1825.
- The Eighteenth Edition, with notes by J. Chitty, London, 1826 (often reprinted in America).
- 'Commentaries on the laws of England: in four books] / by Sir William Blackstone ... ; together with such notes of enduring value as have been published in the several English editions ; and also, a copious analysis of the contents ; and additional notes with references to English and American decisions and statutes, to date, which illustrate or change the law of the text ; also a full table of abbreviations and some considerations regarding the study of the law, by Thomas M. Cooley. Published: Chicago: Callaghan and Co., 1871, Second Edition 1876, Third Edition 1884, Fourth Edition edited by James DeWitt Andrews 1899.
- Commentaries on the laws of England / by Sir William Blackstone, KT. Edition Information: From the author's 8th ed., 1778 / edited for American lawyers by William G. Hammond ; with copious notes, and references to all comments on the text in the American reports, 1787–1890. Published: San Francisco : Bancroft–Whitney Company, 1890. Description: 4 vols.
- Commentaries on the Laws of England in Four Books / by Sir William Blackstone. Notes selected from the editions of Archibold, Christian, Coleridge, Chitty, Stewart, Kerr, and others, Barron Field's Analysis, and Additional Notes, and a Life of the Author by George Sharswood. In Two Volumes. (Philadelphia: J.B. Lippincott Co., 1893).
- Commentaries on the laws of England : in four books / by Sir William Blackstone ; with notes selected from the editions of Archbold, Christian, Coleridge, Chitty, Stewart, Kerr, and others ; and in addition, notes and references to all text books and decisions wherein the Commentaries have been cited, and all statutes modifying the text by William Draper Lewis. Published: Philadelphia : Rees Welsh and Company, 1897. Description: 4 vols.
- Commentaries on the Laws of England by Sir William Blackstone, Kt. ; edited by William Carey Jones. Published: San Francisco : Bancroft–Whitney, 1915–16. Description: 2 vols.
- Blackstone's Commentaries on the Laws of England; edited by Wayne Morrison. 4 vols. Published: London: Routledge–Cavendish; London, England: 2001. Description 4 vols.
- Wilfrid Prest, ed. (2016), Commentaries on the Laws of England, Oxford: Oxford University Press, ISBN 978-0-19-960103-5.
Ralph Thomas in Notes & Queries, 4th Series, II August 8, 1868 gave the following list of the abridgements of Blackstone's Commentaries.
- A Summary of the Constitutional Law of England: being an Abridgment of Blackstone's Commentaries. By the Rev. Dr. J. Trusler, 1788, 12mo ; 228 and index. "Everything in Blackstone necessary for the general reader is here comprised ... and nothing omitted but what is peculiarly adapted to the profession of a lawyer." (Advertisement.)
- The Commentaries of Sir W. Blackstone, Knight, on the Law and Constitution of England, carefully abridged in a new manner, and continued down to the present time, by Wm. Curry 1796, 8vo; viii. contents, 566. 2nd edit. 1809. Consists of selections of the most essential parts in the words of the author.
- Commentaries on the Law of England, principally in the order, and comprising the whole substance, of Commentaries of Sir W. Blackstone. [By J. Addams], 1819, 8vo.
- An Abridgment of Blackstone's Commentaries. By John Gifford [pseud. i. e. Edward Foss], 1821, 8vo. See No. VI.
- An Abridgment of Blackstone's Commentaries on the Laws of England, in a series of Letters from a Father to his Daughter, chiefly intended for the Use and Advancement of Female Education. By a Barrister at Law, F.R., F.A., and F.L.S. [Sir E. E. Wilmot], 1822, 12mo; viii. 304.
- Same by Sir J. E.E. W. . . . A new edition [the 2nd] corrected ... by his son Sir J. E. E. W. 3rd edit. 1855.
- Blackstone's Commentaries on the Laws of England, abridged for the Use of Students, &c. By John Gifford, author of the Life of . . . . Pitt [pseud. John Richards Green], 1823, 8vo.
- The British Constitution; or, an Epitome of Blackstone's Commentaries on the Laws of England, for the Use of Schools. By Vincent Wanostrocht, LL.D., Alfred House Academy, Camberwell, 1823, 12mo; xi. 845.
- An American Abridgment, 1832. [Mr Thomas may be referring to John Anthon's An Analytical Abridgment of the Commentaries of Sir William Blackstone on the laws of England: in four books: together with an analytical synopsis of each book, printed and published by Isaac Riley in 1809, second edition 1832.]
- Select Extracts from Blackstone's Commentaries, carefully adapted to the Use of Schools and Young Persons; with a Glossary, Questions, and Notes, and a General Introduction. By Samuel Warren, 1837, 12mo; xxvi. 428 (no index).
- Commentaries on the Laws of England, in the Order and Compiled from the Text of Blackstone, and embracing the New Statutes and Alterations to the present time. By J. Bethune Bayly, of the Middle Temple, 1840, roy. 8vo; li. 700.
- A Synopsis of Blackstone's Commentaries. London. . A large single sheet in folio.
- The Law Student's First Book, being chiefly an Abridgment of Blackstone's Commentaries; incorporating the Alterations in the Law down to the present time. By the Editors of The Law Student's Magazine, 1848, 12mo; xxiv. 508, xvi.
- Blackstone's Commentaries systematically arranged and adapted to the existing State of the Law and Constitution, with great Additions. By S. Warren, . . . 1855, 8vo 2nd edition, 1856. See IX. The original portions of Blackstone are indicated.
- The Student's Blackstone; Selections from the Commentaries on the Laws of England. By Sir W. B.; being those portions of the work which relate to the British Constitution and the Rights of Persons. By R. M. Kerr, 1858, 12mo; xix. 575. The Student's Blackstone's Commentaries on the Laws of England, in four books, by Sir W. Blackstone, &c., abridged ... By R. M. Kerr. 2nd edit. 1865, 12mo; xx. 612.
Other abridgments include:
- Blackstone economized: being a compendium of the laws of England to the present time by Sir William Blackstone, David Mitchell Aird Published: London: Longmans, Green, & Co.: 1878
- Essentials of the Law: A Review of Blackstone's Commentaries for the Use of Students at Law (1882) Author: Marshall Davis Ewell Published: Boston: Charles C Soule: 1882
- Selections from Blackstone edited by William Carey Jones Published: San Francisco: Bancroft–Whitney Co. 1926.
- The Sovereignty of the Law: Selections from Blackstone's Commentaries on the Laws of England edited by Gareth Jones, Published: London: Macmillan, 1973 ISBN 0-8357-4720-4
- Boorstin, Daniel J., The Mysterious Science of the Law: An Essay on Blackstone's Commentaries (Univ. Chicago, 1996). ISBN 0-226-06498-0
- Stacey, Robert D. Sir William Blackstone and the Common Law: Blackstone's Legacy to America (ACW, 2003) ISBN 1-932124-14-4
- Blackstone, William, Commentaries on the Laws of England, facsimile edition with introductions by Stanley N. Katz. (Univ. Chicago, 1979). 4 vols. ISBN 0-226-05538-8, ISBN 0-226-05541-8, ISBN 0-226-05543-4, ISBN 0-226-05545-0
- "Blackstone, Sir William". Law Hall of Fame.
- Bentham, Jeremy (1776). Fragment on Government.
- Jenks, Edward (1922). "Preface". Stephen's Commentaries on the Laws of England. 1 (17th ed.). London: Butterworth. pp. v–ix – via HeinOnline.; H. D. H. (November 1926). "[Review of] Stephen's Commentaries on the Laws of England Eighteenth edition". The Cambridge Law Journal. 2 (3): 435. doi:10.1017/S0008197300112103.
- Tucker, St. George (1803). "Blackstone's Commentaries with Notes of Reference".
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- Commentaries on the laws of England, original edition 1765
- The commentaries on the laws of England of Sir William Blackstone (1876, London : John Murray. Edited by Robert Malcolm Kerr)
- Commentaries on the laws of England: in four books, edited by Thomas Cooley, Callaghan & Co, 1884—Third Edition
- The Student's Blackstone Adapted and Abridged by R M N Kerr, William Clowes & Son, 1885—Ninth Edition
- Commentaries on the Laws of England public domain audiobook at LibriVox