The expression is almost synonymous with the expression „law of the book of horns“. There are a number of venerable legal sources that distill the Common Law on various subjects known as the Restatement of the Law. Specific titles are „The Restatement (First) of Contracts“ or „The Restatement of Agency“, etc. Each of these volumes is divided into sections starting with text printed in bold, which is a basic rule on one aspect of the contract, agency, etc. This „restatement“ is followed by comments and examples that expand on the specified principle. In an 1831 case before the U.S. Supreme Court, Jackson was ex. Bradstreet v. Huntington, the phrase „black letter“ was used: „It is rare for a case in our time to benefit so much from the black letter; but the course of decisions in New York makes it inevitable… ».
 The term „Black Letters Act“ was used in Naglee v. Ingersoll, 7 pa. Canada is an example of such a state within the common law jurisdiction and the use of the Black Letter doctrine. Canada is a monarchical state whose roots lie in colonial England, and black letter law is the legal principle that is accepted by the majority of judges in most provinces and territories. . . .