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BOOK XII. 



feet, and of the mouth and bottom one foot. In the back part of the furnace 

 is a rectangular hole, measuring in height and width a palm, through which 

 the heat penetrates into a third furnace which adjoins it. 



This third furnace is rectangular, eight feet long and six feet wide ; it 

 also consists of two chambers, of which the lower has a mouth in front, so that 

 firewood may be placed on the hearth which is on the ground. On each side of 

 this opening in the wall of the lower chamber is a recess for oblong earthen- 

 ware receptacles, which are about four feet long, two feet high, and one and 

 a half feet wide. The upper chamber has two holes, one on the right side, 

 the other on the left, of such height and width that earthenware receptacles 

 may be conveniently placed in them. These latter receptacles are three 

 feet long, one and a half feet high, the lower part one foot wide, and the 

 upper part rounded. In these receptacles the glass articles, which have been 

 blown, are placed so that they may cool in a milder temperature ; if they were 

 not cooled slowly they would burst asunder. When the vessels are taken 

 from the upper chamber, they are immediately placed in the receptacles 

 to cool. 



A ARCHES OF THE SECOND FURNACE. B MOUTH OF THE LOWER CHAMBER. 

 C WINDOWS OF THE UPPER CHAMBER. D BIG-BELLIED POTS. E MOUTH OF THE 



THIRD FURNACE. F RECESSES FOR THE RECEPTACLES. G OPENINGS IN THE UPPER 



CHAMBER. H OBLONG RECEPTACLES. 



