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So what if the Ivy League doesn't exactly scare Notre Dame in football? Columbia's fencers are the best in the U.S. So, probably, are Yale's swimmers: what other team can boast a man (Don Schollander) who won four gold medals at the 1964 Olympics? Then there are Cornell's hockey players and Pennsylvania's league champion basketball team. From now on, though, nobody will know for sure how good any of the Ivy athletes are—because last week the league angrily withdrew from all N.C.A.A. championship competition.

Cause of the Ivy defection was a regulation, adopted at last year's N.C.A.A. convention, barring athletes with...