The impress of the intellect of Philip II. is no less manifest in the great storehouse of books in the Escorial than in the Church and in the Monastery. It accords with the character of the founder that he should desire to possess a vast collection of the world’s choicest volumes of theology and philosophy, for, like Solomon, Philip esteemed wisdom as highly as the supremacy of rulership and the possession of great riches. His ambition as a student and an art collector was as keen as his craving for sovereignty and might. We have seen how he had applied himself in his youth to the study of literature and of languages, and the respect which he yielded to the sciences, arts, and letters. The civilised world was searched; the libraries of all nations were overhauled to stock the Library of the Escorial with great books and precious manuscripts. Greece, Arabia, and Palestine contributed to the Bibliotheca of the kingly scholar, and the collection of volumes was at one time the finest in Europe. Philip himself took the greatest interest in the Library. He worked at the catalogue and annotated the list of volumes. The original collection was greatly augmented from time to time by the purchases made on the king’s behalf by agents, who travelled in various countries, by the seizure of volumes belonging to heretics, and by works presented by loyal and wealthy subjects. Castillo was one of Philip’s book-hunters; the catalogue of Arabic books and documents was prepared by the learned Father Sigüenza. A suitable repository for the books was erected at the Escorial under the supervision of Philip. The vaulted ceiling was painted by Vicente Carducci, an Italian artist of great distinction, who may be ranked as the chief of the Italian designers employed to embellish the Escorial. Carducci’s mural paintings in the Library are perhaps the finest of all the fresco works in the building. He was assisted by Tibaldi of Bologna, an artist of meagre talent, who represented Philosophy, Grammar, Arithmetic, Astronomy, and other sciences and certain of the arts, upon his portion of the ceiling. The Library is well lighted by windows. Even the shelves display the taste of the founder, for they are beautifully carved by Flecha. The tables are of marble and jasper, and the floor is paved with marble. Between the rows of shelves are some portraits of Spanish sovereigns, and among them is Carreño’s picture of Charles II. at the age of fourteen. Pantoja painted the Emperor Charles V. and the portraits of Philip II. and Philip III. The pictures represent the subjects in life-size. Juan de Herrera, the famous architect of the Escorial, is presented on one of the canvases by an anonymous artist. Isabella of Portugal, wife of Charles V., is portrayed here, together with another portrait of Charles V. in boyhood, which hangs in the same room. The bust of Cicero in the Library was said to have been unearthed at Herculaneum.