490 ANNUAL, REPORTS OF DEPARTMENT OF AGRICULTURE. 



The following table shows the value of surplus war materials 

 actually received by the State highway departments and the Depart- 

 ment of Agriculture up to June 30, 1922: 



State. 



Alabama 



Arizona 



Arkansas 



California 



Colorado 



Connecticut 



Delaware 



Florida 



Georgia , 



Idaho 



Illinois 



Indiana 



Iowa 



Kansas 



Kentucky 



Louisiana 



Maine 



Maryland 



Massachusetts. . . 



Michigan 



Minnesota 



Mississippi 



Missouri 



Montana 



Nebraska 



Nevada 



New Hampshire 



Total value 

 of material 

 delivered. 



$2,352,057 

 2,436,823 

 2, 376, 257 

 4,463,012 

 3, 189, 530 

 776, 426 

 419, 263 

 2, 126, 165 

 4, 244, 778 

 1,563,328 

 6,314,468 

 5, 067, 439 

 3, 627, 527 

 3,819,984 

 2,415,469 

 2,001,044 

 1,129,080 

 1,674,163 

 1.286,304 

 6, 033, 424 

 3, 384, 433 

 2, 994, 715 

 4, 448, 381 

 2,291,787 

 3,210,623 

 1,314,817 

 532,853 



New Jersey 



New Mexico 



New York 



North Carolina. 

 North Dakota. . 



Ohio 



Oklahoma 



Oregon 



Pennsylvania . . 

 Khode Island . . 

 South Carolina. 

 South Dakota. . 



Tennessee 



Te.xas 



Utah 



Vermont 



Virginia 



Washington 



West Vrginia. . 



Wisconsin 



Wyoming 



?2, 128, 139 

 2, 148, 374 

 7, 874, 065 

 3,777,6.55 

 1,621,603 

 5, 372, 866 

 2,692,467 

 2, 058, 265 

 4, 528, 909 



336, 770 

 1,964,464 

 2,904,169 

 3, 938, 101 

 7, 855, 378 

 1, 439, 278 



748, 818 

 3, 270, 993 

 1, 478, 733 

 3,251,135 

 3, 735, 374 

 1,133,277 



Total 139,773,986 



Retained by Department of Agricul- 

 ture I 10, 473, 750 



Grand total t 150, 147,736 



ROAD-MATERIAL TESTS AND RESEARCH. 



As previously mentioned, the activity in research and the prom- 

 ising results that have been obtained have been outstanding develop- 

 ments of the past fiscal year. To some extent the bureau has been 

 associated with practically all the major investigations that have 

 been in progi^ess. 



The research carried on by the division of tests at the depart- 

 ment experimental farm at Ai'lington, Va., is regarded not only as the 

 most important function of the division, but as one of the most valu- 

 able services the bureau is performing. 



Road design has until recently been almost entirely a matter of 

 judgment and precedent. Even when the probable weight of the 

 traffic that would follow improvement has been ascertainable, and 

 the climatic and soil conditions have been known with a fair degree 

 of defmiteness, the lack of definite knowledge of the eft'ects of these 

 factors upon the road has prevented the employment of such scien- 

 tific methods of design as have been applied to other engineering 

 structures. The purpose "of such investigations as are now being 

 conducted is to develop such methods of road design, and though the 

 results thus far obtained are indicative rather than conclusive, 

 certain fundamental principles are gradually being evolved that 

 ultimately will form the basis of scientific methods and permit the 

 design of more durable and economical roads. 



The investigations at Arlington include the measurement of 

 motor-truck impact on highway surfaces, determination of the re- 

 sistance to impact of various kinds of road surfaces, the drainage of 

 subgrades, the characteristics of subgrade materials, the study of 



