[355] On Gerbert see Lettres de Gerbert publiées avec une introduction, etc., par Julien Havet (Paris: Picard, 1889; I have cited them according to this edition); Œuvres de Gerbert, ed. by Olleris (Clermont and Paris, 1867); also in Migne, Pat. Lat. 139; Richerus, Historiarum libri IV. (especially lib. iii. cap. 55 sqq.); Mon. Germ. script. iii. 561 sqq.; Migne, Pat. Lat. 138, col. 17 sqq. Also Picavet, Gerbert, une pape philosophe (Paris: Leroux, 1897); Cantor, Ges. der Mathematik, i. 728-751 (Leipzig, 1880); Prantl, Ges. der Logik, ii. 53-57 (Leipzig, 1861).
[356] Ep. 12.
[357] Mon. Germ. scriptores, iii. 686.
[358] Ep. 44.
[359] Presumably Gerbert’s German-speaking scholars are meant.
[360] Ep. 45, Raimundo monacho.
[361] Ep. 46, ad Geraldum Abbatem.
[362] I.e. on the affairs of the monastery of Bobbio.
[363] A Greek doctor of Augustus’s time, who wrote on the diseases of the eye.
[364] Ep. 130.