and other eminent collectors, for access to their specimens, which has afforded me facilities for arriving at the conclusions, historical, chemical, and manipulatory, now submitted to the Reader.

Such Facts and Curiosities in the History of Glass as have come to my knowledge of late years, I have engrafted upon my former Memoir "On the Origin, Progress, and Improvement of Glass Manufacture," published many years ago, but long since out of print; and this constitutes the First Section of the present Treatise. The Second Section treats of the Constituents and Manufacture of Glass, or in other words, of Practical Glass-making. And in the Third Section are described and illustrated the various Manipulatory Processes of the Art, more in detail than are to be found in any work on Glass-making, ancient of modern, British or foreign. The practical illustrations consist of working diagrams, drawn in the Glass-house; besides a very attractive Series of representations in colours, of Antique and Mediæval Specimens, including some of the Curiosities of Egyptian, Roman, Chinese, and Venetian Glass-making; and unquestionably, possessing highly artistic beauty, as well as evidence of ingenious manufacture.

It may be observed that the literature of the ancient and middle ages affords but meagre information upon