In 1886, the twenty-year old Aby Warburg, scion of the Hamburg banking family, began to keep records of his book purchases. In the same year, he enrolled as a student at the University of Bonn to study art history, archaeology, classical mythology, and the philosophy of history. He spent 1888–89 in Florence, assisting August Schmarsow in the founding of a German art-historical institute. Apart from a subsequent stint at the University of Strassburg, he spent...