42 BULLETIN" 105, IT. S. DEPARTMENT OF AGRICULTURE. 
Section No. 1. — Refined coal tar — Penetration method. 
The section was not resurfaced since last inspected, and the 
surface while not generally loose presented the appearance of a 
plain macadam road which had been bonded largely by traffic. All 
of the seal coat, with the exception of two small areas totaling 
approximately 24 square feet, has been worn off. 
Section No. 2.- — Refined tar preparation — Penetration method. 
Approximately one-half of the seal coat has been worn off and this 
section showed a rather uneven surface. A number of small raveled 
places are in evidence, extending generally from the outside of the 
main traveled way to the edges. The surface of this section has 
been broken for numerous water connections and the stone replaced 
in a loose manner without even tamping, and this is thought to be 
largely responsible for the general appearance of the surface. 
Section No. 3. — Oil asphalt — Penetration method. 
With the exception of the two small depressions noted in the 
inspection of November 22, 1911, this section j)resented a smooth, 
well-bonded surface, slightly mosaic in appearance. It could not 
be dug into with a knife and gave a hard metallic ring under horses' 
hoofs. The depressions were evidently due to settlement, and no 
raveling has taken place. 
SUPPLEMENTARY REPORT OF EXPERIMENTS MADE AT YOUNGSTOWN, 
OHIO, 1909. 
SLAG, SLAG AND LIME, SLAG AND WASTE SULPHITE LIQUOR PREPARATION, AND SLAG 
AND TAR. 
The original report of these experiments was published in Circular 
No. 92, and reports of annual inspections are given in Circulars Nos. 
94, 98, and 99. The inspection on which the following report is 
based was made on September 1, 1913, and the sections are discussed 
in the order of their section numbers, beginning at Mahonhig Avenue. 
Section No. 1. — Blast-furnace slag; Section No. 2. — Blast-furnace slag and 
lime; Section No. 3. — Blast-furnace slag and waste sulphite liquor prepa- 
ration. 
The wear on these three sections has been quite uniform. The 
surfaces are well bonded and firm, and the crown is practically the 
same as when the road was originally constructed. The only differ- 
ence noted in any of these sections was that on sections Nos. 2 and 3 
the No. 1 stone was more in evidence on the surface than in section 
No. 1, and there were also very slight ruts in the traveled way. 
