DUST PREVENTION AND ROAD PRESERVATION, 1914, 35> 
At the time of the inspection the experiment was again in very bad 
condition, and it appeared to be breaking up throughout its entire 
length. Numerous potholes, extending through the full thickness 
of the road, were forming, and the bituminous material appeared to 
have lost its life. The easterly 50 feet, however, continued in 
somewhat better condition than the remainder of the experiment. » 
EXPERIMENT No. 3 (Fiuxep Native ASPHALT—Mrxing MeETHOD). 
Except where openings have been made for house connections, 
at about stations 5+40, 5+80, and 6+80, this section remains in 
very good condition. The patches placed at the openings are now 
somewhat below the original grade. Along the north side for the 
last 30 feet and for a width of from 3 to 4 feet there are a few waves 
about 3 feet long and 1 inch or less in depth. It is also possible in 
wet weather to notice slight waves, perhaps not over one-sixteenth 
inch in depth, extending entirely across the roadway. These were 
evidently caused by the manner of pouring the seal coat at the time’ 
of construction. | 
EXPERIMENT No. 4 (REFINED CoaL Tar—Mrixine METHOD). 
This section is in excellent condition except for the foilowing 
imperfections: The edges on both sides are a little wavy, the waviness 
being more pronounced between stations 8 +00 and 8+ 465 for a width 
of 5 feet on the north edge and between stations 8+45 and 9+00 
on the south edge for a width of about 10 feet. At station 9+54 a 
pothole is forming on the north edge. The seal coat is gone from 
stations 10 +68 to 10+ 98 for a width of about 5 feet on the south edge. 
At station 10 +90, on the north side, a house connection was made and 
as the work of restoration was not properly done, the pavement at 
this point is not in first-class condition. 
EXPERIMENT No. 5 (Cut-Bacx Om AspHALT—MIxiING METHOD). 
A rut developed in this section during the winter of 1913-14, and 
this, together with the holes reported in the last inspection report, 
was repaired in May, 1914. The deeper holes were patched with 
14-inch stone and hot refined coal tar, applied by the penetration 
method at the rate of 14 gallons to the square yard. The rut was 
patched with #-inch stone, sand, and hot refined coal tar. 
At the time of inspection the surface of the following portions of the 
experiment was found to be good: An irregular strip through the 
center from 6 to 8 feet in width, the whole intersection opposite 
Hardenbrook Street for a width of about 35 feet, the south side from 
stations 13+00 to 13+23, and the north side from stations 12 +50 
to 13+94. Over the remainder of the experiment the seal coat is 
disappearing, and potholes are forming. The whole section is wavy 
