BOOK VIII. 



351 



bituminous, then the bitumen bums and can be smelled. These furnaces have 

 a structure hke the structure of the furnaces in which ore is smelted, except 

 that they are open in front ; they are six feet high and four feet wide. As 

 for this kind of furnace, three of them are required for one of those in which 

 the cakes are melted. First of all they are roasted in the first furnace, then 

 when they are cooled, they are transferred into the second furnace and again 

 roasted ; 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. 



END OF BOOK VIII. 



