Corpus crebris partubus exhaustum: from one of these is issued, in the tenth degree, the abbé de Sade, the fond and grateful biographer of Petrarch; and this domestic motive most probably suggested the idea of his work, and urged him to inquire into every circumstance that could affect the history and character of his grandmother (see particularly tom. i. p. 122-133, notes, p. 7-58, tom. ii. p. 455-495 not. p. 76-82).