Contains: (p. [5]-57) a translation by José Antonio Conde, edited by Soriano Fuertes, of portions of Alfārābī's Kitab al musika; (p. 58-68) an exposition of the 3d book of Saint Isidorus' Etymologiae, treating of the system of music employed by the Spaniards of his time; (p.[69]-133) "Apuntes .. ...