The Principles of Masonic Law is a treatise on the constitutional laws, usages and landmarks of Freemasonry. The book is very informative and thorough, and it treats a wide range of topics in Masonic jurisprudence, providing a good insight to the overall governance of freemasonry. Freemasonry consists of fraternal organizations that trace their origins to the local fraternities of stonemasons that from the end of the fourteenth century regulated the qualifications of stonemasons and their interaction with authorities and clients. The basic, local organizational unit of Freemasonry is the Lodge. These private Lodges are usually supervised at the regional level by a Grand Lodge or Grand Orient. The degrees of Freemasonry retain the three grades of medieval craft guilds, those of Apprentice, Journeyman or Fellow Craft, and Master Mason.

The division of wrongs, by the writers on municipal law, into private and public, or civil injuries and crimes and misdemeanors, does not apply to the jurisprudence of Freemasonry. Here all wrongs are crimes, because they are a violation of the precepts of the institution; and an offense against an individual is punished, not so much because it is a breach of his private rights, as because it affects the well-being of the whole masonic community. In replying to the question, "what are masonic crimes?" by which is meant what crimes are punishable by the constituted authorities, our safest guide will be that fundamental law which is contained in the Old Charges. These give a concise, but succinct summary of the duties of a Mason, and, of course, whatever is a violation of any one of these duties will constitute a masonic crime, and the perpetrator will be amenable to masonic punishment. But before entering on the consideration of these penal offenses, it will be well that we should relieve the labor of the task, by inquiring what crimes or offenses are not supposed to come within the purview of masonic jurisprudence. Religion and politics are subjects which it is well known are stringently forbidden to be introduced into Masonry. And hence arises the doctrine, that Masonry will not take congnizance of religious or political offenses. Heresy, for instance, is not a masonic crime. Masons are obliged to use the words of the Old Charges, "to that religion in which all men agree, leaving their particular opinions to themselves;" and, therefore, as long as a Mason acknowledges his belief in the existence of one God, a lodge can take no action on his peculiar opinions, however heterodox they may be. In like manner, although all the most ancient and universally-received precepts of the institution inculcate obedience to the civil powers, and strictly forbid any mingling in plots or conspiracies against the peace and welfare of the nation, yet no offense against the state, which is simply political in its character, can be noticed by a lodge. On this important subject, the Old Charges are remarkably explicit. They say, putting perhaps the strongest case by way of exemplifying the principle, "that if a Brother should be a rebel against the State, he is not to be countenanced in his rebellion, however he may be pitied as an unhappy man; and, if convicted of no other crime, though the loyal Brotherhood must and ought to disown his rebellion, and give no umbrage or ground of political jealousy to the government for the time being, they cannot expel him from the lodge, and his relation to it remains indefeasible"