. Glass. ver the middle story; it is used to cool thevessels after their manufacture. ^ We have also thedescription of a smaller furnace, which is perhaps thatin which the more fusible glass for enamels and minorobjects of verroterie was melted. Finally, an oven witha floor of brick-earth is mentioned, for fritting the sandand alkali. In spite of much that is obscure in thisdescription, we can trace in it the general type of furnacewhich, doubtless handed down from Roman times, hassurvived in places with few important changes to thepresent day. And here I may call attention to a contemporarydr
. Glass. ver the middle story; it is used to cool thevessels after their manufacture. ^ We have also thedescription of a smaller furnace, which is perhaps thatin which the more fusible glass for enamels and minorobjects of verroterie was melted. Finally, an oven witha floor of brick-earth is mentioned, for fritting the sandand alkali. In spite of much that is obscure in thisdescription, we can trace in it the general type of furnacewhich, doubtless handed down from Roman times, hassurvived in places with few important changes to thepresent day. And here I may call attention to a contemporarydrawing of a mediaeval glass furnace—a source of in-formation as unique as it is unexpected. This is to befound in a manuscript of an encyclopaedic work, DeOriginibus Rerum, compiled by Rabanus Maurus, oneof the earliest of the schoolmen. Rabanus lived inthe Benedictine monastery of Fulda, in the first half of ^ Compare with this account the furnace now used in Northern India de-scribed in Chapter i
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