F. A. Reuss, _Der heiligen Hildegard Subtilitatum diversarum naturarum creaturarum libri novem, die werthvolleste Urkunde deutscher Natur- und Heilkunde aus dem Mittelalter_. In _Annalen des Vereins für Nassau. Alterthumskunde und Geschichtsforschung_, Bd. VI, Heft i, Wiesbaden, 1859. Jessen, C. in _Sitzb. Vienna, Math, naturw. Klasse_, (1862) XLV, i. 97. Jessen, C. _Botanik in kulturhistorischer Entwickelung_, Leipzig, 1862, pp. 124-26. Jessen, C. in _Anzeiger für Kunde der deutschen Vorzeit_, (1875), p. 175. Von der Linde, _Die Handschriften der Kgl. Landesbibl. in Wiesbaden_, Wiesbaden, 1877. Schmelzeis, J. Ph. _Das Leben und Wirken der hl. Hildegardes_, Freiburg, 1879. Battandier, A. “Sainte Hildegarde, sa vie et ses œuvres,” in _Revue des questions historiques_, XXXIII (1883), 395-425. Roth, F. W. E. in _Zeitsch. für kirchl. Wissenschaft u. kirchl. Leben_, Leipzig, IX (1888), 453. Kaiser, P. _Die Naturwissenschaftliche Schriften der hl. Hildegard_, Berlin, 1901. (_Schulprogramm des Königsstädtischen Gymnasiums in Berlin._) A pamphlet of 24 pages. See also his edition, mentioned above, of the _Causae et curae_. Singer, Chas. “The Scientific Views and Visions of Saint Hildegard,” in _Studies in the History and Method of Science_, Oxford, 1917, pp. 1-55. Dr. Singer seems unacquainted with the above work by Kaiser, writing (p. 2) “The extensive literature that has risen around the life and works of Hildegard has come from the hands of writers who have shown no interest in natural knowledge.” Yet see also Wasmann, E. “Hildegard von Bingen als älteste deutsche Naturforscherin,” in _Biologisches Zentralblatt_ XXXIII (1913) 278-88. Herwegen in the _Kirchl. Handlexicon_ (1908), I, 1970. [340] Migne, 28, citing Baronius, _Ann._ 1148, from _Epist. S. Thomas_, I, 171. [341] I have noted one MS of them in the British Museum, Harleian 1725. [342] Migne, 84-85, 129-130. [343] CLM 2619, 13th century, Gebenonis prioris Cisterc. in Eberbach, Speculum futurorum temporum sive Compendium prophetiarum S. Hildegardis; also, at Rome, Bibl. Alex. 172, 14th century, fols. 1-29. [344] Early MSS of the _Liber Scivias simplicis hominis_ are Palat. Lat. 311, 12th century, 204 fols.; Merton 160, early 13th century. [345] Citing Preyer, _Gesch. d. deutsch. Mystik._ 1874; Hauck, _Kirchengesch_, _Deutsch_. IV, 398; Von Winterfeld, _Neue Archiv_, XXVII, 297. [346] Migne, 101, _quaedam de natura hominis et elementorum, diversarumque creaturarum_. Singer, taking the words as an exact title of one work, tries to deny that they apply even to the _Subtilitates_; but the writer of the _Vita_ is obviously simply giving a general idea of the subjects treated by Hildegard. [347] In what is so far the only known extant copy, a thirteenth century MS at Copenhagen, which Jessen discovered in 1859 and called attention to in 1862 (_Act. Acad. Vindob._, XLV, i. 97-116), the Titulus is _Causae et curae_ (shown in facsimile by Singer (1917), Plate 5a.)