BOOK VIII.

35i

bituminous, then the bitumen bums and can be smelled. These furnaces havea structure like the structure of the furnaces in which ore is smelted, exceptthat they are open in front ; they are six feet high and four feet wide. Asfor this kind of furnace, three of them are required for one of those in whichthe cakes are melted. First of all they are roasted in the first furnace, thenwhen they are cooled, they are transferred into the second furnace and againroasted ; later they are carried to the third, and afterward back to the first,and this order is preserved until they have been roasted seven or nine times.

A—Cakes. B—Bundles of faggots. C—Furnaces,

wmm

mm

mm

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mm HI

mm

wm.

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mm

KSs'

nag

mm

flt'vSS'

mm

mm

END OF BOOK VIII.