U. S. DKPARTMKXT OF AGRICULTURE, 



BUREAU OF CHEMISTRY BULLETIN NO. 79. 



H. W. WILEY, ( *u. 



THE TESTING OF ROAD MATERIALS, 



INCLUDING THE METHODS USED AND THE RESULTS OP.TAINED 

 IN THE ROAD MATERIAL LABORATORY, 



IN COLLABORATION WITH THE OFFICE OF PUBLIC-ROAD 



INQUIRIES. 



BY 



WALLER 



(.'kief, Rocul Mati'i'ivl. Lnlntratory t 

 WITH THE COOPERATION OF 



S. OUSHMAIST, 



, lload M<.tti-n<d 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1903. 



