The result of these studies was the publication of a book in the year 1769, which he called, _A Representation of the Injustice and Dangerous Tendency of Tolerating Slavery in England_.

In this work he refuted, in the clearest manner, the opinion of York and Talbot: he produced against it the opinion of the Lord Chief Justice Holt, who, many years before, had determined that every slave coming into England became free: he attacked and refuted it again by a learned and laborious inquiry into all the principles of Villenage.

He refuted it again by showing it to be an axiom in the British constitution, "That every man in England was free to sue for and defend his rights, and that force could not be used without a legal process," leaving it to the judges to determine whether an African was a man.

He attacked also the opinion of Judge Blackstone, and showed where his error lay.

This valuable book, containing these and other kinds of arguments on the subject, he distributed, but particularly among the lawyers, giving them an opportunity of refuting or acknowledging the doctrines it contained.
While Mr.Sharp was engaged in this work, another case offered, in which he took a part: this was in the year 1768.