Definition
A mixed jury is a jury composed of members drawn from two distinct groups — historically, either (1) citizens and aliens, or (2) persons of different racial backgrounds — assembled to ensure that a party with ties to a group outside the ordinary jury pool is judged, at least in part, by members of that group. The concept rests on the premise that impartiality is better secured when the tribunal reflects the community of the litigant, not just the community of the forum.
Two historically distinct uses of the term must be kept separate:
1. Citizen-alien mixed jury: A jury drawn half from citizens of the forum and half from aliens (foreign nationals), assembled when a foreign party appeared before a domestic court. This is the jury de medietate linguae, sometimes called the "jury of the half-tongue." It was a recognized common law institution carried forward into early American practice and had procedural rules governing its composition.
2. Racial mixed jury: A jury composed partly of white and partly of Black jurors. This usage emerged primarily in American legal discourse following the Civil War and Reconstruction, appearing in civil rights statutes and litigation over the composition of juries in cases involving Black defendants or litigants.
These two meanings share the same label but arise from entirely different legal traditions and policy concerns.
Common Confusion
The term "mixed jury" is frequently conflated with the broader concept of a representative or impartial jury. They are not synonymous. A representative jury is one that statistically mirrors the community; a mixed jury in its historical sense was a specifically constructed body — half from one group, half from another — not merely a jury that happened to include diverse members. Researchers who encounter "mixed jury" arguments in Reconstruction-era sources should not assume the term carries its alien-party meaning; the racial-composition meaning dominated American legal discourse in that period. The two meanings can appear in sources from the same decade without any acknowledgment that the term is doing double duty.
Why It Matters in Research
This term is a research trap precisely because it carries two meanings that peaked in different eras and different bodies of law. The citizen-alien meaning is the older common law meaning and dominates in English sources and early American materials through the early nineteenth century. Researchers working in colonial-era records, admiralty practice, or early federal court proceedings who encounter "mixed jury" should immediately cross-reference DE MEDIETATÆ LINGUAE, where the procedural rules and statutory history are developed.
The racial-composition meaning is almost entirely an American phenomenon and emerges sharply after 1865. Civil rights statutes of the Reconstruction era, particularly the Civil Rights Act of 1875 and related federal legislation, generated litigation over whether Black citizens had a right to serve on juries in cases involving Black parties. In that corpus, "mixed jury" becomes a term of advocacy and contestation, not a neutral procedural label. Researchers should be alert to the fact that courts and commentators in this period sometimes used "mixed jury" descriptively, sometimes aspirationally, and sometimes dismissively.
There is also a subtler trap: the silence of later sources. By the late nineteenth century, the jury de medietate linguae had effectively disappeared from American practice, and the racial-composition meaning had been largely suppressed by the rollback of Reconstruction. Twentieth-century legal dictionaries often handle the term briefly or only under the alien-party meaning, which can mislead researchers into thinking the racial-composition usage was marginal. It was not marginal in its era.
Corpus connections: researchers following this term into equality and due process arguments about jury composition will need to move quickly to the Sixth and Fourteenth Amendment lines of doctrine, where "mixed jury" as a phrase largely gives way to the language of fair cross-section and equal protection.
Historical Dictionary Support
Black's Law Dictionary handles the term briefly, defining it as a "bilingual jury" and a "jury of the half-tongue," then redirecting to DE MEDIETATÆ. This reflects the English common law tradition and gives no independent weight to the racial-composition meaning — an omission that reveals something about the edition's focus and the period in which it was compiled.
Bouvier's is more useful here. Bouvier gives both meanings explicitly: the racial-composition meaning (citing CIVIL RIGHTS) and the citizen-alien meaning (citing MEDIETATE LINGUE). This dual treatment makes Bouvier the more complete starting point for researchers trying to understand the full range of the term's use. The pairing of the two meanings without reconciling them is itself historically instructive — it reflects a moment when American law was actively renegotiating who counted as an outsider requiring special jury accommodation.
Neither source traces the decline of either meaning, and neither addresses the constitutional dimensions that would later govern jury composition claims. Researchers should treat both entries as opening references, not as complete accounts.
Jurisdictional Note
The jury de medietate linguae had statutory recognition in England and was recognized in some American jurisdictions, but its adoption was uneven across states and it fell into disuse without formal abolition in most American courts. The racial-composition version of the mixed jury was contested across Southern states during Reconstruction and was the subject of federal enforcement efforts that varied significantly in effectiveness by jurisdiction.
Encyclopedia Cross-Reference
The Law Mind Criminal Law Encyclopedia: Mistrial and Hung Jury (criminal_212) — for jury composition and deliberation structure.
The Law Mind Criminal Law Encyclopedia: Grand Jury — Fifth Amendment in Grand Jury Proceedings (criminal_169) — for related questions about jury selection and constitutional constraints on jury composition.