by the theologians Bidembach, _De causis matrimonialibus tractatus_ (Frankfort, 1608); Mentzer, _De conjugio tractatus_ (Wittenberg, 1612); and by the jurists Cypräus, _De connubiorum jure_ (Frankfort, 1605); Nicolai, _Tractatus de repudiis et divortiis_ (Dresden, 1685); and Brouwer, _De jure connubiorum_ (Amsterdam, 1665), whose book has the distinction of being placed on the _Index_. On the other hand, in the age of Luther a more liberal direction is taken by Erasmus, _Annat. in Nov. Testam._ (Basel, 1515); whose influence, according to Richter, is felt by Zwingli, "Ordnung wie zu Zürich ... über eelich sachen gericht soll werden" (1525): in Richter, _Kirchordnungen_, I, 21, 22; and his "Commentary on Matthew xix, 9," in Richter, _Beiträge_, 7; and by Zwingli's disciple Bullinger, _Der christlich Ehestand_ (1579). The laxer tendency is also represented by Lambert of Avignon, _De sacro conjugio_ (Strasburg, 1524); Melanchthon, "De conjugio" (1551), in _Opera_, I (Erlangen, 1828); Bucer, whose work is mentioned in connection with the English Reformation; the jurist Monner, _Tract. de matrimonio et clandestinis conjugiis_ (Jena, 1561); and in the seventeenth century especially by Hülsemann, _Extensio breviarii theologici_ (3d ed., Leipzig, 1655); and the jurist Forster, _De nuptiis_ (Wittenberg, 1617). The more essential parts of the works of Luther, Brenz, Bugenhagen, Bullinger, and Melanchthon may also be found in that remarkable treasury of materials gathered by Sarcerius, _Ein Buch vom heiligen Ehestande_ (1553); enlarged under title _Corpus juris matrimonialis_ (Frankfort, 1569).