30 BULLETIN 105, II. S. DEPARTMENT OT AGRICULTURE. 
resulting in the formation of depressions and corresponding humps. 
On July 11 the section was repaired and given a light surface treat- 
ment with the material originally applied. The larger depressions 
were filled with 1-inch limestone and the water-gas tar preparation 
which had been used on section Xo. 1. The small depressions were 
filled with fine screenings and the oil originally used on this section. 
All humps were removed with a mattock. TVhen such repairs had 
been made, oil was applied at the rate of 0.10 gallon per square yard 
throughout the most traveled area by allowing it to run from the 
bung of the barrel and distributing it with hand push brooms. The 
application was covered with a thin layer of torpedo sand. 
The total cost of maintenance for the year was $25.49, or 2.33 
cents per square yard for the entire section. 
TThen inspected in January, the general appearance of the surface 
was satisfactory, but the wearing carpet appeared to be developing 
.numerous fine cracks throughout the entire length. The portion 
over the steam pipes required further repair in the early winter, and a 
change in the form of construction at this point will probably be 
made. 
Section No. 3. — Residual petroleum. 
As noted in Circular No. 99, this section showed a tendency to 
become muddy in wet weather, and after periods of continued rain 
the surface was covered with a deep oily mud, which traffic gradually 
worked into low ridges along the edges of the road. By summer 
the surface of the macadam began to be exposed throughout the 
traveled way, and a light treatment with the oil originally used 
was made on July 9, 1913. The oil was applied at the rate of about 
0.10 gallon per square yard throughout the most traveled area in the 
same manner as on section Xo. 2 and was covered with torpedo sand. 
The total cost of this work was $20.65, or 2.92 cents per square 
yard, for the entire section. 
The section now presents a generally satisfactory appearance 
excepting for a small area on the grade at the west end. The treat- 
ment is largely worn off here, but this is almost entirely due to the 
condition of the adjoining pavement and gutter, where water is held 
for some time after a storm and continually carried on the oiled 
section by traffic. 
Section No. 4. — Asphaltic petroleum. 
This surface gave excellent service in both wet and dry weather, 
but, owing to the light treatment which had been given, it gradually 
wore off until the underlying macadam was exposed in places through- 
out the traveled way. A second application of about 0.10 gallon 
per square yard of the oil originally used was made in July. 1913, 
