Considerations on the Negroe cause commonly so called: Addressed to the Right Honourable Lord Mansfield, lord chief justice of the Court of King's Bench, &c

In Short

This book serves as a formal legal argument responding to the landmark Somerset v. Stewart case, which challenged the status of enslaved people on English soil. It is a polemic from a pro-slavery perspective, asserting that Parliament’s long-standing regulation of the African trade effectively established the legal status of Negroes as "property" or "merchandise." By framing the issue as one of commercial law rather than human rights, the author contends that the courts have no authority to declare enslaved people free, as doing so would contradict the established statutes of the British Empire.

The Story

The narrative arc of the book follows a structured legal argument, beginning with the author’s dissatisfaction regarding the judgment in the Somerset case. The author, a Member of Parliament, addresses the presiding Lord Mansfield, expressing his bewilderment at how the court could ignore the precedent set by previous legal opinions—specifically those of Sir Philip Yorke and Lord Talbot—which held that an enslaved person brought to Great Britain remained the property of their owner.

The author argues that the entire debate has been clouded by "heated passions and imaginations" surrounding the word "slavery." To clear this mist, he proposes to drop the term entirely and replace it with the concept of "commercial property." He guides the reader through a meticulous examination of various Acts of Parliament, ranging from the reign of Charles II to his own time. He highlights statutes that regulated the Royal African Company and subsequent acts concerning trade in the American colonies. He points to these laws, which classify enslaved people alongside "lands, forts, castles, and military stores," as ironclad proof that the British legislature legally defined these individuals as assets—goods and chattels—to be bought, sold, and used as security for debts.

As the argument progresses, the author addresses the objection that these laws were only meant for the colonies and should not apply in England. He dismisses this as a "distinction without a difference," asserting that colonial law is inextricably linked to the laws of the mother country. He argues that property is not a transient state that changes based on geography; if a merchant buys a person in Africa, that ownership is a permanent, legally vested interest that follows the property wherever it goes.

Towards the conclusion, the author ventures into philosophical and anthropological speculation. He attempts to provide a rationale for why the law might treat people this way, citing the "physical" and "intellectual" differences he claims exist between races. He characterizes African societies as lacking a developed moral sense, relying on the assertion that they occupy a lower rung in the natural order. He ends by warning that a judgment in favor of freedom would have disastrous economic consequences, potentially driving the slave trade from Africa to England and leading to the mass sale of human beings in London’s own markets. He ultimately leaves the decision to the court, insisting that his role is not to create law, but to point out that the current law already mandates the recognition of property rights in enslaved people.

How It Unfolds

The rejection of sentimentality The author begins by dismissing humanitarian concerns as mere "imagination" and insists that the legal status of the enslaved must be viewed strictly through the lens of commerce. He argues that emotional reactions to the term "slavery" have blinded the court to the cold reality of property law.

The citation of statutes The heart of the book involves a detailed review of Parliamentary acts that facilitated the African trade. He insists that since the legislature explicitly treated humans as assets in these laws, the courts are bound to recognize that property status as a fact of law.

The rejection of geographical limits The author tackles the argument that property rights should vanish upon reaching English soil. He maintains that colonial laws and English laws are one and the same, and that an ownership claim, once legally established, cannot simply be extinguished by crossing an ocean.

The pseudo-scientific justification In the final stages, the author attempts to ground his legal claims in natural philosophy. He posits that innate differences in intellectual and moral capacity explain why such individuals were legislatively reduced to "articles of trade," effectively naturalizing the legal status he defends.

The People

Samuel Estwick, the author and a Member of Parliament, is the central voice. He portrays himself as a seeker of "truth" and an objective legal analyst. He wants to convince the judiciary that their previous, more lenient stance on enslaved people is legally incoherent. He is blocked by what he views as a dangerous, sentimental shift in public opinion that threatens the commercial interests of the British Empire.

Lord Mansfield, the Lord Chief Justice, is the recipient of these "Considerations." Estwick treats him with the calculated deference of a litigator, though he clearly expects Mansfield to adhere strictly to the letter of the law—as Estwick interprets it—rather than to evolving notions of natural liberty.

James Somerset, the enslaved man who brought the legal challenge, is referenced primarily as a legal entity or a piece of contested "property." For Estwick, Somerset is not a person with rights, but a vessel through which the court determines the security of all British commercial investments.

The "great and wise men" of the legal past, specifically Sir Philip Yorke and Lord Talbot, are utilized as the author’s primary authorities. By invoking their past opinions, Estwick attempts to frame his own reactionary position as the conservative, established legal consensus.

In Its Own Voice

"It is an odious word, that engendered this law-suit, and now feeds and supports it with the fuel of heated passions and imaginations."

The author dismisses the term "slavery" as a distraction, preferring to discuss the legal status of humans as property.

"If it be not, let state necessities justify state tricks."

The author acknowledges that the legality of his position may conflict with reason, suggesting that political expediency should take precedence.

"From this then, my Lord, I infer, that the measure of these beings may be as compleat, as that of any other race of mortals; filling up that space in life beyond the bounds of which they are not capable of passing."

The author argues that enslaved people are an inherently inferior species, providing a justification for why the law would rightfully treat them as commercial goods.

What It's Really About

At its core, this book is an exploration of how legal systems can be weaponized to dehumanize people by categorizing them as property. The central question is whether the law is a tool of justice or a mechanism for protecting established commercial interests. Estwick argues that once a system has codified humans as "assets," it is logically inconsistent for the law to then grant those assets the rights of citizens. The book captures a pivotal moment where the legal definitions of personhood and property were being forcibly contested, and it reveals the lengths to which defenders of the slave trade went to argue that their actions were not only profitable, but fully consistent with the existing parliamentary statutes of their era.

Why Read It Today

Readers interested in the history of legal rhetoric and the evolution of human rights will find this a chilling, precise example of how institutional power justifies exploitation. It is a difficult read, not because of its prose—which is clear and direct—but because of its cold, unapologetic defense of slavery as a standard commercial arrangement. The author’s attempt to use "science" and "natural philosophy" to support his legal arguments offers a clear window into the intellectual strategies used to uphold white supremacy in the 18th century.

You will find it valuable if you want to understand the specific legal arguments that once faced abolitionists. It does not contain the passionate, moralizing language of the anti-slavery movement; instead, it is a dry, surgical analysis that highlights how "the law" can be interpreted to protect cruelty. The experience of reading it is one of exposure: you see, in the author's own words, the exact arguments used to deny humanity to others. It is a sobering, essential text for anyone studying the history of the law, the mechanisms of systemic injustice, and the rhetoric of colonial-era commerce. It remains a stark reminder that legal "reasoning" has, in history, been used to justify the most unreasonable of human actions.