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ranges from 2034 to 3400, proving oxide of lead to have been used in their manufacture; the mean gravity of modern flint-glass being 3200.     From what we gather from the foregoing facts, we are inclined to the belief that, in fine fancy work, in colors, and in the imitation of gems, the ancient glass-makers excelled the modern ones. They were also acquainted with the art of making and using moulds for blown and pressed glass, and forming what in England is now called patent pillar glass. All these operations, however, were evidently on a very limited scale, their views being mainly directed to the production of small but costly articles. Although in the time of the Roman manufacturers vases of extra size were made, requiring larger crucibles and furnaces than those used by the glass-makers of Tyre, yet it is evident that they produced few articles except such as were held sacred for sepulchral purposes, or designed for luxury. And while they possessed the knowledge of the use of moulds to press and blow glass by expansion, it does not appear that they produced any articles for domestic use. If it were not thus, some evidence would be found among the various specimens which have been preserved.