Like the Gallic Druids, they recited their laws in a kind of sing-song to prevent their being forgotten, a practice still in existence in the days of Aristotle (Problemata, xix.
Massaria, De peste (Venice, 1597); Diomedes Amicus, Tres tractatus (Venice, 1599), 4to; Victor de Bonagentibus, Decem problemata de peste (Venice, 1556), 8vo; Georgius Agricola, De peste libri tres (Basel, 1554) 8vo.
Of the latter the best known are Summula casuum conscientiae (1627); Liber theologiae moralis (1644), and Universae theologiae moralis problemata (1652-1666).
3 The Problemata physica was at the same time put into English (with some changes and omission of part of the mathematical appendix), and presented to the king, to whom the work was dedicated in a remarkable letter apologizing for Leviathan.
In 1674, at the age of eighty-six, he published his Principia et problemata aliquot geometrica, ante desperata nunc breviter explicate et demonstrate (L.