Adenoids and Diseased Tonsils: Their Effect on General Intelligence

In Short

This book is a psychological study published in 1922 that investigates the widely held, yet scientifically unsupported, assumption that physical defects like enlarged tonsils and adenoids cause mental dullness in children. Through a controlled experiment comparing children who underwent surgery against a control group, the author systematically dismantles the notion that these operations result in measurable increases in IQ or general intelligence. It remains a valuable historical example of how empirical evidence can successfully challenge prevailing medical and educational dogmas, marking a shift toward more cautious, data-driven pediatric health standards.

The Story

At the beginning of the 20th century, the medical community and school administrators largely viewed adenoids and diseased tonsils as clear, mechanical culprits in the stagnation of a child’s mental development. The prevailing theory was simple: mouth-breathing caused by these obstructions led to deficient blood oxidation, which in turn stunted brain activity. Consequently, "have them out" became a common refrain for any child struggling in school.

The author begins by surveying the existing literature of the time, finding that most arguments for surgery were based on anecdotal evidence or flawed observations rather than rigorous testing. She notes that physicians often cautioned against the wholesale removal of tonsils, suspecting they might serve a purpose in early childhood, yet such warnings were frequently ignored in favor of the hope for a "mental cure."

To address this, the author designs a two-part investigation conducted between 1919 and 1921. First, she performs a statistical study of over 500 children, comparing the intelligence quotients of those with diseased tonsils against those with healthy ones. Finding no significant difference in their intelligence levels, she then moves to a longitudinal experiment. She selects groups of children needing surgery, pairing each with a "control" child of similar age and ability who does not undergo the operation. She tracks these children over six-month and twelve-month intervals, using Binet intelligence tests, the Healy Picture Completion Test, and physical measurements like height, weight, and grip strength.

The findings are remarkably consistent and contrary to the popular expectations of the era. While some children showed minor improvements in weight or physical health following their operations, there was no measurable, sustained gain in intelligence compared to the children who remained untreated. The author observes that while previous studies had noted improvements in school marks after surgery, those gains were likely due to better health, attention, and resistance to fatigue, rather than any actual change in inherent "general intelligence." She concludes that because there was no intelligence gain following the surgery, it is reasonable to assume there was no initial mental retardation caused by the conditions. The book ends by advocating for future research that distinguishes between school efficiency—often influenced by physical well-being—and true intellectual capacity, ultimately debunking the idea that surgery serves as a shortcut to improved mental performance.

How It Unfolds

The prevailing assumption The author outlines the common, unsubstantiated belief that physical obstructions in the throat were the primary cause of childhood stupidity. She highlights how contemporary writers, such as H. Addington Bruce, insisted that prompt surgery was the only way to help a child regain mental health.

The methodology of doubt Dissatisfied with the lack of controlled evidence, the author describes her plan to test the theory by pairing children who need surgery with control subjects who do not. She explains the use of Terman’s revision of the Binet test and the Healy Picture Completion Test to measure actual cognitive changes rather than relying on subjective teacher reports.

The statistical realization She analyzes the initial data from over 500 children and discovers that those with tonsillar defects possess intelligence quotients identical to those without. This realization serves as the foundation for her later, more intensive longitudinal experiment.

The evidence of the operation She reports on the results after six months and then again after twelve months, showing that while physical health markers like weight might fluctuate, intelligence test scores remain stagnant across the board. The author methodically proves that the operative group does not outperform the control group in any cognitive measure.

The final verdict The study concludes that surgical intervention does not raise IQ, though it may improve a child’s physical endurance and capacity for schoolwork. The author warns that teachers and doctors must stop conflating school performance with innate intelligence when recommending invasive procedures.

The People

The Child The central figure is the school-aged boy—between six and fourteen—who is the subject of the surgery. He is expected by the society of the time to become "smarter" once his tonsils are removed. Instead, he simply recovers from the procedure, showing, at best, a minor gain in weight or physical energy, but remaining the same person he was before.

The Advocate Represented by figures like the psychologist H. Addington Bruce, the advocate stands for the prevailing, unscientific consensus. They want to believe in a "quick fix" for struggling children, and their enthusiasm for the operation acts as the primary obstacle to a more nuanced understanding of childhood development.

The Investigator The author, Margaret Cobb Rogers, acts as the steady, objective observer. Her desire is not to prove a point but to interrogate the efficacy of a widespread medical practice. She ends the book more skeptical of the link between surgery and IQ than she was at the start, having been transformed by the data into a critic of the "mental cure" theory.

In Its Own Voice

"There is no doubt of the physical handicap borne by a child who is possessed of them."

The author acknowledges the genuine physical discomfort adenoids cause while simultaneously preparing the reader to doubt their impact on the intellect.

"Contrary to expectation, there seems to be very little difference in intelligence between a group of children whose throats are normal, and one in whom the tonsils are diseased or badly enlarged."

This sentence summarizes the author’s primary finding, which defies the widespread medical prejudices of her time.

"No rise in I.Q., as a result of operation, makes itself evident after six months or after twelve months."

This final, flat statement serves as the definitive answer to the question that prompted the entire research project.

What It's Really About

This book is a study in the necessity of empirical skepticism. It addresses the dangerous tendency of both medical practitioners and educators to accept simple, singular explanations for complex problems like low academic performance. At its core, it explores the tension between popular "common sense"—which in 1922 dictated that removing tonsils would solve a child's mental woes—and the hard data provided by psychological testing. It asks the reader to consider whether surgery is being performed to treat a patient's health or to satisfy an educator's desire for a student who is more easily managed, ultimately warning against the dangers of treating the symptom while misunderstanding the cause.

Why Read It Today

Readers interested in the history of psychology, the evolution of pediatric medicine, or the rise of evidence-based policy will find this book fascinating. It captures a specific moment when the field of psychology began to assert its authority to test the claims of medicine. The reading experience is clinical and precise; the author does not hide the complexities of her data, including the difficulties of maintaining a control group or the variations in test scores that occur over long periods.

One must be prepared for the dry, technical nature of the text, which is dense with tables, charts, and statistical methodologies. The language is scholarly, reflecting the academic standards of Columbia University in the early 1920s. While it is not a "story" in the literary sense, the narrative arc—from the questioning of a widespread myth to the final, data-backed debunking—is deeply satisfying. It serves as a potent reminder of how easily, and how often, society can confuse health improvements with intelligence gains. Modern readers will walk away with a lasting appreciation for the author’s courage in challenging the status quo and a healthy skepticism toward any "miracle cure" proposed for childhood development.