In his eighty-seventh year, George Santayana. the poet and philosopher. brought to completion his last major work, Dominations and Powers, a manuscript on which he had been working ever since Hitler turnedEurope into an armed camp. Santayana found sanctuary in the Convent of the Blue Nuns in Rome; and here after the liberation of Italy he was joined by Daniel Cory, an American scholar who since 1930 had been serving first as his secretary and then as his confidant. Mr. Cory, now Santayana’s literary executor, describes the philosopher’s reappraisal of his own work, which occupied him in the months before his death.