Chapter 15

26. The best short account of the Albigenses is to be found in vol. i. of H.C. Lea's _Histoire de L'Inquisition au moyen âge_, Paris, 1903. This, the French translation, is superior to the English edition as it contains the author's last corrections, and a number of bibliographical notes. The Adoptionist theory is stated in the introduction to F.C. Conybeare's _Key of Truth_, Oxford, 1908. The _Chanson de la Croisade Albigeoise_, P. Meyer, Paris, 1875, 2 vols., is indispensable to students of the subject. In these works will be found much of the extensive bibliography of the heresy and crusade.

27. Eckbertus, _Serm. adv. Catharos, Migne, Patr. Lat._, tom. 193. p. 73.

28. _Cf._ Milman, _Latin Christianity_, Book IX. chap. viii. p. 85.

29. On religious lyric poetry, see Lowinsky, _Zeitschrift für französische Sprache und Litteratur_, xx. p. 163 ff., and the bibliographical note to Stimming's article in Gröber's _Grundriss_, vol. ii. part ii. § 32.