Meyer Schapiro (1904-96), renowned for his critical essays on nineteenth- and twentieth-century painting, also played a decisive role as a young scholar in defining the style of art and architecture known as Romanesque. And, appropriately, when he was invited to deliver the prestigious Charles Eliot Norton Lectures at Harvard, he chose Romanesque architectural sculpture as his topic. These lectures, acclaimed for the verve and freshness with which Schapiro delivered them, languished unpublished for decades. But Linda Seidel, who knew Schapiro well and attended the 1967 lectures, has now...