In 1644, he published "Dissertatio de anno civili et calendario reipublicae Judaicae", in 1646 his treatise on marriage and divorce among the Jews entitled "Uxor Ebraica", and in 1647 the earliest printed edition of the old English law-book "Fleta". In 1650 Selden began to print the trilogy he planned on the Sanhedrin, as the first part of "De synedriis et prefecturis juridicis veterum Ebraeorum" through the press, the second and third parts being severally published in 1653 and 1655. The aim of this work was to counter the use by the Presbyterians, in particular, of arguments and precedents drawn from Jewish tradition; it was a very detailed study aimed at refuting such arguments, and pointing out the inherent flexibility of the tradition that was being cited.