Until comparatively recently books had been really quite rare. When Jefferson’s father died in 1757, he left a library of forty-two books, and that was regarded as pretty impressive. A library of four hundred books—the number that John Harvard left at his death—was considered so colossal that they named Harvard College after him. Over the course of his life, Harvard had acquired books at the rate of about twelve a year. Jefferson, over the course of his life, bought books at the rate of about twelve a month, accumulating a thousand every decade on average.

