Very few details have reached us of the famous glass works which existed at Cadalso, in the province of Toledo; we know, however, that the glass made there was as excellent as that made at Cataluña, and was compared in a similar manner to the Venetian. The unknown author of "El Crotalon," published by the Spanish Bibliophiles, from a rare MS., in 1871, writing in the time of the Emperor Charles V., mentions "the fine glass made at Cadalso." Marineus Siculus also writes in 1517 in his "De las Cosas Memorables de España," [Alcala de Henares, 1539, fol., Vol. I.,] that "Glass was made in several towns of Castile, the most important of them being Cadalso, which supplied the whole kingdom." It would appear therefore that this glass manufactory was already established in that locality in the 16th century, and we frequently meet with allusions to the excellence of its productions in contemporary authors. The town itself has continually been called "Cadalso de los vidrios." Mendez Silva in his "Poblacion general de España," [Madrid, 1645, p. 40] says: "They make in three glass ovens fine glass of beautiful colours and forms, which can compete with the Venetian." At the South Kensington Museum, there are two fine specimens of glass made at Cadalso--No. 1068, '73, a drinking vessel of white glass, the upper part in form of the Spanish vessel called "bucaro," ribbed and streaked with colours; the stem pineapple shape, with remains of gilding (this is represented in the woodcut); and No. 1082, '73, a bowl of plain glass, the lower part spirally waved, and decorated with scale pattern in gold and coloured dots. Both these objects proceed from a nunnery in a village near Cadalso. [Illustration: GLASS VESSELS FROM SPAIN, IN THE SOUTH KENSINGTON MUSEUM.] Larruga says in his "Memorias," [Madrid, 1791, Vol. X., p. 53,] that "two glass ovens existed at Cadalso, which belonged to the Marchioness of Villena; they are worked by the inhabitants of this town. One of the ovens has fallen into disuse from the beginning of the present (18th) century, and the fame of the glass made there, formerly so renowned for its clearness and variety of the objects made, has declined. In examining the state of this industry during the reign of Charles II. we find how much it had fallen off, for Dn. Antonio de Obando in 1692, undertook to reestablish it, and to make glass vessels, and window glasses as had been made there formerly. It appears that 200 dozens of objects of different kinds were sent out from there yearly." The vase, No. 333, '73 represented in the woodcut is an example of the coloured glass of Cadalso. [Illustration: GLASS VASE.--SPANISH (CADALSO), 17TH CENTURY.]