56 BULLETIN 555, U. S. DEPARTMENT OF AGRICULTURE. 
Brick pavement: Page. 
Vitrified paving brick 28 
Granulated slag for cushion 15 
Sand for cushion 21 
Grouting sand 20 
Asphalt cement for use as poured joint filler 23 
Refined tar for use as poured joint filler 25 
Stone block pavement: 
Stone block 12 
Granulated slag for cushion 15 
Sand for cushion 21 
Grouting sand 20 
Asphalt cement for use as poured joint filler 23 
Refined tar for use as poured joint filler 25 
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