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Aviation is another Jock Whitney enthusiasm, but chiefly as an adjunct to polo and racing. Greentree is his polo team and he is a four-goal man, as good a back as hard-riding Pete Bostwick is a forward. Last summer he built a new field, carved out of the side of a hill on the Whitney place at Manhasset. L. I. Too heavy to ride his own steeplechasers in races, he rides to hounds, shoots, plays squash, flies his own cabin-plane, which was last year nearly destroyed by fire in its hangar at Roosevelt Field. The name of his plane— Pegasus—is the kind of gesture that is fully understandable only to horse people, people who find, as Jock Whitney does, a rich and serious importance in the thundering field, bunched at the start, narrowing to the first thorn fence at Aintree.