[86] Lelewel, op. cit., Vol. II, p. 2.
[87] Raumer, F. v. Geschichte der Hohenstaufen und ihre Zeit. Leipzig, 1878. Vol. III, p. 493. This astronomical tent has sometimes been referred to as a globe.
[88] Libros del Saber de Astronomia del Rey D. Alfonso X de Castilla. Compilados, anotados y comentados por Don Manuel Rico y Sinobas. Madrid, 1863-1867. See especially Vol. I, pp. 153 ff.
[89] Enciclopedia Universal illustrada, “Campano”; Tiraboschi, G. Storia della letteratura italiana. Roma, 1782-1785. Tom. IV, lib. ii, cap. ii, §v; Fiorini. Sfere terrestri. pp. 40-56.
There are numerous manuscripts of Campano to be found in the University Library of Bologna, in the Ambrosiana of Milan, and in the Library of San Marco in Venice. Fiorini refers to a number of writers who may be said to have followed and in part copied Campano.
[90] Albertus Magnus. Liber de coelo et mundo. Lib. II 4, c. 9. For a short biography of Albertus see Encyclopaedia Britannica, “Albertus Magnus.”
[91] Günther, S. Geschichte des mathematischen Unterrichtes, im deutschen Mittelalter bis zum Jahre 1525. Berlin, 1887. pp. 184 ff.
[92] Catalogue of Printed Books in the British Museum contains a list of more than fifty editions, the first being printed in the year 1472.
[93] Biographies are numerous. See Dictionary of National Biography, “Roger Bacon,” with bibliographical list. See Bacon’s Opus Magnus, lib. I, 152-153, “necesse est vero mundum extra habere figuram spericam ...”; also lib. IV, in which he treats of the form of the earth.
[94] See for a short biography Nouvelle biographie. Paris, 1866. “Thomas d’Aquin.”