Diary
Anthony Grafton: Warburg, 1 April 1999
“... banking family and is said to have sold his birthright in the family firm to his younger brother Max, after reaching 13, the Jewish age of maturity, in return for a promise to buy him all the books he wanted. Aby rebelled against the family’s Orthodox and mercantile tradition; and like other German Jews from similar backgrounds, he decided to study art ... ”