The Scopes Monkey Trial was a 1925 court case in Dayton, Tennessee, in which a high school biology teacher named John T. Scopes was prosecuted for teaching evolution in a public school. The trial became one of the most famous legal spectacles in American history, pitting religious belief against scientific inquiry in a courtroom drama that attracted national attention and still shapes debates over education today.
The Law That Started It All
In March 1925, Tennessee passed the Butler Act, making it illegal for any teacher in a publicly funded school “to teach any theory that denies the story of the Divine Creation of man as taught in the Bible, and to teach instead that man has descended from a lower order of animals.” Violating the law was a misdemeanor carrying a fine of $100 to $500, roughly $1,700 to $8,500 in today’s dollars.
The American Civil Liberties Union saw the law as unconstitutional and placed advertisements in Tennessee newspapers offering to cover the legal expenses of any teacher willing to challenge it. In Dayton, a group of local businessmen and civic leaders saw an opportunity to put their small town on the map. They recruited John Scopes, a 24-year-old high school teacher who had used George William Hunter’s Civic Biology, a standard textbook that included a chapter on evolution and natural selection. Scopes agreed to be indicted as a test case.
The Textbook at the Center
The book Scopes used in class, originally published in 1914, taught that early humans “must have been little better than one of the lower animals” and described Charles Darwin’s theory of natural selection as the mechanism driving the development of new species. It was a widely used biology textbook, not a radical document, though it also contained passages that reflected the prejudices of its era. The volume ranked human races on an evolutionary scale, calling Caucasians “the highest type of all,” and advocated for eugenics. These passages were not at issue in the trial, but they illustrate how the textbook carried assumptions common in early 20th-century science.
The Two Giants in the Courtroom
What transformed a local misdemeanor case into a national event was the involvement of two towering public figures. Clarence Darrow, the most famous defense attorney in America, volunteered to represent Scopes without charging a fee. He had built his career defending progressive causes and unpopular defendants, and he saw the case as a fight against religious bigotry in public life. William Jennings Bryan, a three-time Democratic presidential nominee and one of the most celebrated public speakers in the country, joined the prosecution. Bryan had spent years campaigning against the teaching of evolution and considered it a threat to Christian faith and morality. He had not practiced law in roughly 30 years.
Scopes himself was a reluctant celebrity. He knew the local prosecutors personally and was friendly with them. He did not relish the spotlight, but he believed the Butler Act was unjust and wanted it challenged.
What Happened During the Trial
The trial began on July 10, 1925, and lasted eight days. Hundreds of reporters descended on Dayton. It was one of the first trials broadcast live on radio, turning a small-town courtroom into a stage for a nationwide debate over science, religion, and the role of government in education.
The legal question was narrow: did Scopes teach evolution in violation of the Butler Act? But the cultural question was enormous, and Darrow pushed the trial far beyond its legal boundaries. The judge blocked Darrow from calling scientific experts to testify about the validity of evolution, ruling that the only question before the jury was whether Scopes had broken the law. Darrow then made an unusual move. He called Bryan himself to the witness stand as an expert on the Bible.
What followed became the most famous exchange in American trial history. Darrow grilled Bryan on whether the Bible should be taken literally. He asked about Jonah being swallowed by a great fish, Joshua commanding the sun to stand still, and the age of the earth. Bryan tried to hold his ground, insisting he believed in the Bible but acknowledging that some passages were illustrative rather than literal. When pressed on whether the “days” of creation in Genesis could have been longer than 24 hours, Bryan conceded they might represent longer periods. This admission undermined the strict literalist position he had championed, and many observers felt Darrow had exposed contradictions in Bryan’s worldview. Bryan, for his part, framed his testimony as a defense of faith against “the greatest atheist or agnostic in the United States.”
The Verdict and Its Aftermath
The outcome was never really in doubt. Darrow actually asked the jury to return a guilty verdict so the case could be appealed to a higher court, where the constitutionality of the Butler Act could be tested. The jury obliged, convicting Scopes after just nine minutes of deliberation. The judge fined him $100.
Five days after the trial ended, William Jennings Bryan died in his sleep in Dayton. He was 65.
The case went to the Tennessee Supreme Court in 1927. The court upheld the Butler Act as constitutional but overturned Scopes’s conviction on a technicality: the judge, rather than the jury, had set the fine amount, which violated Tennessee procedure. By tossing the conviction on technical grounds, the court prevented any further appeal, effectively killing the ACLU’s strategy of bringing the case before the U.S. Supreme Court. The Butler Act remained on the books in Tennessee until 1967.
Scopes never returned to teaching. He went on to study geology and worked in the oil industry. In later years, he made public appearances and wrote a memoir about the trial. At sentencing, he told the judge: “I feel that I have been convicted of violating an unjust statute. I will continue in the future, as I have in the past, to oppose this law in any way I can.”
Why the Trial Still Matters
The Scopes Trial did not settle the legal question of evolution in public schools. It took more than 40 years for the U.S. Supreme Court to do that. In 1968, the Court struck down an Arkansas anti-evolution law modeled directly on the Butler Act. The ruling in that case declared that a state’s right to set its school curriculum “does not carry with it the right to prohibit, on pain of criminal penalty, the teaching of a scientific theory or doctrine where that prohibition is based upon reasons that violate the First Amendment.” The Court held that banning evolution from classrooms amounted to an unconstitutional establishment of religion.
The Scopes Trial mattered less as a legal precedent and more as a cultural turning point. It was the first time the tension between religious authority and scientific education played out on a national stage, and it established the framework for every debate that followed, from creationism in the 1980s to intelligent design in the 2000s. The trial exposed a fault line in American life that has never fully closed: how a society that values both religious freedom and scientific literacy decides what to teach its children.