In the last two years of his confinement the prisoner read an immense quantity of books quite indiscriminately. At one time he was busy with the natural sciences, then he would ask for Byron or Shakespeare. There were notes in which he demanded at the same time books on chemistry, and a manual of medicine, and a novel, and some treatise on philosophy or theology. His reading suggested a man swimming in the sea among the wreckage of his ship, and trying to save his life by greedily clutching first at one spar and then at another.