A 



LETTER OF TRANSMITT.AL. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF CHEMISTRY, 

 Washington, D. C. , August ^, 1904- 



SIR: I have the honor to transmit for your approval a manuscript 

 containing the results of investigations made in the Division of Tests 

 of this Bureau on the cementing power of road materials. Although 

 the methods at present employed for the determination of this very 

 important property of road materials can not be considered final, yet 

 it is deemed advisable that those interested in the subject should be 

 made acquainted with the progress of the work up to the present time. 

 I recommend, therefore, that this report be published as Bulletin 

 No. 85 of the Bureau of Chemistry. 

 Respectfully, 



H. W. WILEY, Chief. 

 Hon. JAMES WILSON, 



Secretary of Agriculture. 



