44 BULLETIN 105, U. S. DEPARTMENT OF AGRICULTURE. 



A surface treatment of the entire section is recommended to prevent 

 further disintegration. 



Experiments Nos. 9 and 10. — Refined water-gas tar — Mixing method. 



These sections were in excellent condition. The west end of section 

 No. 10 had been treated with an asphaltic oil for a distance of about 

 35 feet where the street beyond the experiment was repaired. 



SUPPLEMENTARY REPORT OF EXPERIMENTS MADE AT GARDEN CITY, 

 DODGE CITY, BUCKLIN, AND FORD, KANS., 1908. 



SAND CLAY. 



The original report of these experiments was published in Circular 

 No. 90, and reports of annual inspections are given in Circulars Nos. 

 92, 94, 98, and 99. The following are reports of inspections made 



in 1913. 



Experiment at Garden City. 



The Santa Fe Road at Garden City, Kans., 12 by 765 feet, was 

 inspected on December 19, and found to be in poor condition. The 

 recent rains have had a damaging effect upon the gypsum clay 

 surfacing, and have softened it into a muck-like condition varying 

 from 2 to 4 inches in depth. This is more noticeable at the north 

 end where some new gypsum has been added without sand, but the 

 mud is in evidence throughout the entire course. The road has re- 

 cently been worked with a small 2-horse grader, and the material has 

 been pushed to the center in such a way as to give a uniform slope 

 and crown. The road is reported to have been in excellent condition 

 all last summer and will be so again as soon as it is dried out. 



Experiment at Dodge City. 



The Mineola Road, improved by a clay and sand composition 14 

 by 9,750 feet, was inspected on December 19, 1913, and found to be 

 generally in good condition throughout the whole course, with one 

 exception, where a chuck hole of minor importance was in evidence. 

 The ditches were in good order, the cross section uniform, and the 

 edges of surfacing not broken by the attacks of traffic. It has been 

 well maintained by dragging done by a near-by farmer whenever 

 necessary, but, owing to recent and continuous rains for two weeks, 

 the surface of the roadway had softened to the extent of being 

 deformed by traffic, showing slight hoof marks and incipient ruts. 

 At the extreme north end, for a distance of 75 feet, some new mate- 

 rial has been added and left in an unfinished condition. 



Experiment at Bucklin. 



The Spearville Road, at Bucklin, Kans., was inspected on Decem- 

 ber 20, 1913, and the clayed surfacing, which was 14 by 4,271 feet, 



