her
tablets. So Miselle thanked him, smiling a little in her turn, and they
parted in mutual satisfaction.

"These trucks you see are ready-loaded with the frit, or glass-material,
and are to be wheeled down to the furnaces presently," said Cicerone.
"But, before following them, we had better go down and see the fires."

Descending a short flight of stone steps, the party now entered a long,
dark passage, through which a torrent of wind swept, driving before it
the ashes and glowing cinders that dropped continually from a circular
grating overhead. The ground beneath was strewn with fire, and the whole
arrangement offered a rare opportunity to any misanthrope whose
preferences might point to death in the shape of a fiery shower-bath.

In a gloomy crypt, opening near the grating, stood a gnome whose duty it
was to feed the furnace overhead with soft coal, which must be thrown in
at a small door and then pushed up and forward until it lay upon the
grating where it was consumed. Around this central fire the glass-pots,
ten to each furnace, are arranged, their lower surfaces in actual
contact with it, while the domed roof reverberates the heat upon them
from above.

All around stood sturdy piers of brick and iron, and low-browed arches,
crushed, one could not but fancy, out of their original proportions by
the immense weight they were forced to uphold.

Returning to the Inferno, Cicerone led the way to a pot which was being
filled with frit from one of the little covered cars that he had pointed
out in the mixing-room. This process was to be effected gradually, as he
explained,--a certain portion being at first placed in the heated pot,
and suffered to melt, and then another, until the pot should be full,
when the door of it would be put up and closed with cement.

"And how long before the frit will be entirely melted?" asked Monsieur.

"From thirty-six to sixty hours. The time varies a good deal with the
seasons, and different sorts of glass take different times to melt. This
flint-glass melts the easiest, and common bottle-glass takes the
longest. Crown-glass, such as is used for window-panes, comes between
the two; but that is not made here."

"And when the glass is sufficiently boiled, what next?"

"You shall see, for here is a pot just opened, and this man with the
long iron rod, called a pontil, or punty, in his hand, is about to skim
it."

"What is there to skim off?"

"Oh, there will be impurities, of