A Philosophical Novelist: George Santayana and The Last Puritan is available from Southern Illinois University Press or from  Amazon Books.

This is a psychographic study of the philosopher that combines perspectives drawn from his life, his philosophical writings, and his own autobiography, with special attention to his one novel, The Last Puritan. Unusual is the emphasis on the philosophy of Spinoza, which Santayana saw as the foundation of his own thinking. A review of A Philosophical Novelist appeared in the Sewanee Review  (Autumn, 1998).
 

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