“Some would impugn the genuineness of all her writings,” says the article on Hildegard in _The Catholic Encyclopedia_, “but without sufficient reason.”[345] Kaiser, who edited the _Causae et curae_, had no doubt that both it and the _Subtilitates_ were genuine works. Recently Singer has excluded them both from his discussion of Hildegard’s scientific views on the ground that they are probably spurious, but his arguments are unconvincing. His objection that they are full of German expressions which are absent in her other works is of little consequence, since it would be natural to employ vernacular proper names for homely herbs and local fish and birds and common ailments, while in works of an astronomical and theological character like her other visions there would be little reason for departing from the Latin. Anyway Hildegard’s own assertion in the preface of the _Liber vitae meritorum_ is decisive that she wrote that work. The almost contemporary biography of her also states that she wrote “certain things concerning the nature of man and the elements, and of diverse creatures,”[346] which may be a blanket reference to the _Causae et curae_ as well as the _Subtilitates diversarum naturarum creaturarum_. The records which we have of the proceedings instituted by the pope in 1233 to investigate Hildegard’s title to sainthood mention both the _Liber simplicis medicinae_ and _Liber compositae medicinae_ as her works; and later in the same century Matthew of Westminster ascribed both treatises to her, stating further that the _Liber simplicis medicinae secundum creationem_ was in eight books and giving the full title of the other as _Liber compositae medicinae de aegritudinum causis signis et curis_.[347] Kaiser has pointed out a number of parallel passages in it and the _Subtilitates_, while its introductory cosmology seems to me very similar to that of Hildegard’s other three works. Indeed, as we consider the contents of these five works together, it will become evident that the same peculiar views and personality run through them all. [Sidenote: Question of Hildegard’s knowledge of Latin.]