Nice review by Sam Stark in this week's Nation (not available free online) of Anthony Grafton and Joanna Weinberg's book about Isaac Casaubon (1559–1614) (available here).
In his diary, Casaubon writes, "Today I paid the booksellers what I owed. Except for Norton, my debt to whom is the largest. ... I take no thought for my wife, I take no thought for my children. Today I decided that until my wife arrives I will not spend more than a gold sovereign on books—unless something truly rare shows up!"
Mark Pattison's 1875 book on Casaubon is available for free here.