easy to write on as parchment.”
“You are, then, a chemist?”
“Somewhat; I know Lavoisier, and was the intimate friend of Cabanis.”
“But for such a work you must have needed books—had you any?”
“I had nearly five thousand volumes in my library at Rome; but after reading them over many times, I found out that with one hundred and fifty well-chosen books a man possesses, if not a complete summary of all human knowledge, at least all that a man need really know. I devoted three years of my life to reading and studying these one hundred and fifty volumes, till I knew them nearly by heart; so that since I have been in prison, a very slight effort of memory has enabled me to recall their contents as readily as though the pages were open before me. I could recite you the whole of Thucydides, Xenophon, Plutarch, Titus Livius, Tacitus, Strada, Jornandes, Dante, Montaigne, Shakespeare, Spinoza, Machiavelli, and Bossuet. I name only the most important.”