I applied to college one evening, after dinner, in the fall of my senior year in high school. College applicants in Ontario, in those days, were given a single sheet of paper which listed all the universities in the province. It was my job to rank them in order of preference. Then I had to mail the sheet of paper to a central college-admissions office. The whole process probably took ten minutes. My school sent in my grades separately. I vaguely remember filling out a supplementary two-page form listing my interests and activities. There were no S.A.T. scores to worry about, because in Canada we didn’t have to take the S.A.T.s. I don’t know whether anyone wrote me a recommendation. I certainly never asked anyone to. Why would I? It wasn’t as if I were applying to a private club.

I put the University of Toronto first on my list, the University of Western Ontario second, and Queen’s University third. I was working off a set of brochures that I’d sent away for. My parents’ contribution consisted of my father’s agreeing to drive me one afternoon to the University of Toronto campus, where we visited the residential college I was most interested in. I walked around. My father poked his head into the admissions office, chatted with the admissions director, and—I imagine—either said a few short words about the talents of his son or (knowing my father) remarked on the loveliness of the delphiniums in the college flower beds. Then we had ice cream. I got in.

Am I a better or more successful person for having been accepted at the University of Toronto, as opposed to my second or third choice? It strikes me as a curious question. In Ontario, there wasn’t a strict hierarchy of colleges. There were several good ones and several better ones and a number of programs—like computer science at the University of Waterloo—that were world-class. But since all colleges were part of the same public system and tuition everywhere was the same (about a thousand dollars a year, in those days), and a B average in high school pretty much guaranteed you a spot in college, there wasn’t a sense that anything great was at stake in the choice of which college we attended. The issue was whether we attended college, and—most important—how seriously we took the experience once we got there. I thought everyone felt this way. You can imagine my confusion, then, when I first met someone who had gone to Harvard.

There was, first of all, that strange initial reluctance to talk about the matter of college at all—a glance downward, a shuffling of the feet, a mumbled mention of Cambridge. “Did you go to Harvard?” I would ask. I had just moved to the United States. I didn’t know the rules. An uncomfortable nod would follow. Don’t define me by my school, they seemed to be saying, which implied that their school actually could define them. And, of course, it did. Wherever there was one Harvard graduate, another lurked not far behind, ready to swap tales of late nights at the Hasty Pudding, or recount the intricacies of the college-application essay, or wonder out loud about the whereabouts of Prince So-and-So, who lived down the hall and whose family had a place in the South of France that you would not believe. In the novels they were writing, the precocious and sensitive protagonist always went to Harvard; if he was troubled, he dropped out of Harvard; in the end, he returned to Harvard to complete his senior thesis. Once, I attended a wedding of a Harvard alum in his fifties, at which the best man spoke of his college days with the groom as if neither could have accomplished anything of greater importance in the intervening thirty years. By the end, I half expected him to take off his shirt and proudly display the large crimson “H” tattooed on his chest. What is this “Harvard” of which you Americans speak so reverently?

In 1905, Harvard College adopted the College Entrance Examination Board tests as the principal basis for admission, which meant that virtually any academically gifted high-school senior who could afford a private college had a straightforward shot at attending. By 1908, the freshman class was seven per cent Jewish, nine per cent Catholic, and forty-five per cent from public schools, an astonishing transformation for a school that historically had been the preserve of the New England boarding-school complex known in the admissions world as St. Grottlesex.

As the sociologist Jerome Karabel writes in “The Chosen” (Houghton Mifflin; $28), his remarkable history of the admissions process at Harvard, Yale, and Princeton, that meritocratic spirit soon led to a crisis. The enrollment of Jews began to rise dramatically.By 1922, they made up more than a fifth of Harvard’s freshman class. The administration and alumni were up in arms. Jews were thought to be sickly and grasping, grade-grubbing and insular. They displaced the sons of wealthy Wasp alumni, which did not bode well for fund-raising. A. Lawrence Lowell, Harvard’s president in the nineteen-twenties, stated flatly that too many Jews would destroy the school: “The summer hotel that is ruined by admitting Jews meets its fate . . . because they drive away the Gentiles, and then after the Gentiles have left, they leave also.”

The difficult part, however, was coming up with a way of keeping Jews out, because as a group they were academically superior to everyone else. Lowell’s first idea—a quota limiting Jews to fifteen per cent of the student body—was roundly criticized. Lowell tried restricting the number of scholarships given to Jewish students, and made an effort to bring in students from public schools in the West, where there were fewer Jews. Neither strategy worked. Finally, Lowell—and his counterparts at Yale and Princeton—realized that if a definition of merit based on academic prowess was leading to the wrong kind of student, the solution was to change the definition of merit. Karabel argues that it was at this moment that the history and nature of the Ivy League took a significant turn.

The admissions office at Harvard became much more interested in the details of an applicant’s personal life. Lowell told his admissions officers to elicit information about the “character” of candidates from “persons who know the applicants well,” and so the letter of reference became mandatory. Harvard started asking applicants to provide a photograph. Candidates had to write personal essays, demonstrating their aptitude for leadership, and list their extracurricular activities. “Starting in the fall of 1922,” Karabel writes, “applicants were required to answer questions on ‘Race and Color,’ ‘Religious Preference,’ ‘Maiden Name of Mother,’ ‘Birthplace of Father,’ and ‘What change, if any, has been made since birth in your own name or that of your father? (Explain fully).’ ”

At Princeton, emissaries were sent to the major boarding schools, with instructions to rate potential candidates on a scale of 1 to 4, where 1 was “very desirable and apparently exceptional material from every point of view” and 4 was “undesirable from the point of view of character, and, therefore, to be excluded no matter what the results of the entrance examinations might be.” The personal interview became a key component of admissions in order, Karabel writes, “to ensure that ‘undesirables’ were identified and to assess important but subtle indicators of background and breeding such as speech, dress, deportment and physical appearance.” By 1933, the end of Lowell’s term, the percentage of Jews at Harvard was back down to fifteen per cent.

If this new admissions system seems familiar, that’s because it is essentially the same system that the Ivy League uses to this day. According to Karabel, Harvard, Yale, and Princeton didn’t abandon the elevation of character once the Jewish crisis passed. They institutionalized it.

Starting in 1953, Arthur Howe, Jr., spent a decade as the chair of admissions at Yale, and Karabel describes what happened under his guidance:

The admissions committee viewed evidence of “manliness” with particular enthusiasm. One boy gained admission despite an academic prediction of 70 because “there was apparently something manly and distinctive about him that had won over both his alumni and staff interviewers.” Another candidate, admitted despite his schoolwork being “mediocre in comparison with many others,” was accepted over an applicant with a much better record and higher exam scores because, as Howe put it, “we just thought he was more of a guy.” So preoccupied was Yale with the appearance of its students that the form used by alumni interviewers actually had a physical characteristics checklist through 1965. Each year, Yale carefully measured the height of entering freshmen, noting with pride the proportion of the class at six feet or more.

At Harvard, the key figure in that same period was Wilbur Bender, who, as the dean of admissions, had a preference for “the boy with some athletic interests and abilities, the boy with physical vigor and coordination and grace.” Bender, Karabel tells us, believed that if Harvard continued to suffer on the football field it would contribute to the school’s reputation as a place with “no college spirit, few good fellows, and no vigorous, healthy social life,” not to mention a “surfeit of ‘pansies,’ ‘decadent esthetes’ and ‘precious sophisticates.’ ” Bender concentrated on improving Harvard’s techniques for evaluating “intangibles” and, in particular, its “ability to detect homosexual tendencies and serious psychiatric problems.”

By the nineteen-sixties, Harvard’s admissions system had evolved into a series of complex algorithms. The school began by lumping all applicants into one of twenty-two dockets, according to their geographical origin. (There was one docket for Exeter and Andover, another for the eight Rocky Mountain states.) Information from interviews, references, and student essays was then used to grade each applicant on a scale of 1 to 6, along four dimensions: personal, academic, extracurricular, and athletic. Competition, critically, was within each docket, not between dockets, so there was no way for, say, the graduates of Bronx Science and Stuyvesant to shut out the graduates of Andover and Exeter. More important, academic achievement was just one of four dimensions, further diluting the value of pure intellectual accomplishment. Athletic ability, rather than falling under “extracurriculars,” got a category all to itself, which explains why, even now, recruited athletes have an acceptance rate to the Ivies at well over twice the rate of other students, despite S.A.T. scores that are on average more than a hundred points lower. And the most important category? That mysterious index of “personal” qualities. According to Harvard’s own analysis, the personal rating was a better predictor of admission than the academic rating. Those with a rank of 4 or worse on the personal scale had, in the nineteen-sixties, a rejection rate of ninety-eight per cent. Those with a personal rating of 1 had a rejection rate of 2.5 per cent. When the Office of Civil Rights at the federal education department investigated Harvard in the nineteen-eighties, they found handwritten notes scribbled in the margins of various candidates’ files. “This young woman could be one of the brightest applicants in the pool but there are several references to shyness,” read one. Another comment reads, “Seems a tad frothy.” One application—and at this point you can almost hear it going to the bottom of the pile—was notated, “Short with big ears.”

Social scientists distinguish between what are known as treatment effects and selection effects. The Marine Corps, for instance, is largely a treatment-effect institution. It doesn’t have an enormous admissions office grading applicants along four separate dimensions of toughness and intelligence. It’s confident that the experience of undergoing Marine Corps basic training will turn you into a formidable soldier. A modelling agency, by contrast, is a selection-effect institution. You don’t become beautiful by signing up with an agency. You get signed up by an agency because you’re beautiful.

At the heart of the American obsession with the Ivy League is the belief that schools like Harvard provide the social and intellectual equivalent of Marine Corps basic training—that being taught by all those brilliant professors and meeting all those other motivated students and getting a degree with that powerful name on it will confer advantages that no local state university can provide. Fuelling the treatment-effect idea are studies showing that if you take two students with the same S.A.T. scores and grades, one of whom goes to a school like Harvard and one of whom goes to a less selective college, the Ivy Leaguer will make far more money ten or twenty years down the road.