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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