“In their correspondence, Lord Acton and Mary Gladstone frequently dis cussed what should constitute ‘the hundred best books.’ Acton eventually sent her his own list, which, in 1883. she recorded in her diary. The list was first published in July 1905 in Pall Mall Magazine (Volume XXXVI. No.147) with an introduction and critique by Clement Shorter. Here is the list as it appeared there.”
—R. L. Schuettinger, Lord Acton: Historian of Liberty (LaSalle: Open Court, 1976), pp. 237-39.