58 



THE TESTING OF ROAD MATERIALS. 



TAIU.K P> (PART 1). Percentage of common mineral constituents 



[Thr small numerals placed above the percentage figures denote, respectively, whether the mineral 

 po-ed. and t lie secondary those resulting from subsequent change. In sf >me eases the separate deter- 

 two is given in one column and an asterisk or dagger indicates the other mineral.] 



