DUST PREVENTION AND ROAD PRESERVATION, 1914, ot 
very poor condition; the seal coat is gone, and quite a number of 
potholes have been formed, especially on the south side. 
SUPPLEMENTARY REPORT OF EXPERIMENTS MADE AT NEW YORK, 
N. Y., AND RIDGEWOOD, N. J., 1910. 
OIL-CEMENT CONCRETE. 
The original report of these experiments was published in Circular 
No. 94, and the reports of annual inspections appeared in Circulars 
Nos. 98 and 99, Office of Public Roads, and in U. S. Department of 
Agriculture Bulletin No. 105. The following report covers an in- 
spection made in October, 1914. 
EXPERIMENTS AT New York, N. Y. 
This roadway was torn out in its entirety the week of September 
27, 1914. The general condition of the surface of the road had 
oradually deteriorated from the condition shown by the inspection 
reported in December, 1913, and it was decided by the road main- 
tenance department of the Borough of Richmond that the entire 
roadway should be torn up and a new one laid. It has therefore 
been replaced by bituminous concrete on a cement-concrete founda- 
tion. 
EXPERIMENTS AT Ripcewoop, N. J. 
Experiment No. 1.—The oil-cement concrete floor of the bridge over 
Saddle River was covered with a bituminous surfacing, as reported 
in the inspection made in December, 1913. The bituminous-macadam 
surfacing is in first-class condition, and the oil-cement concrete is not 
exposed. 
Experiment No. 2.—The oil-cement concrete floor of the bridge 
over the Hohokus River is apparently in similar condition to that 
reported in December, 1913, excepting for the fact that it is a little 
more worn. The surface is even and smooth and has a rather flat 
cross section. The wear on this bridge floor still continues in the 
center of the roadway, since the sides for a width of from 3 to 4 feet 
from each edge are protected by dirt and leaves. In the center the 
large stones of the aggregate show on the surface, and at the ends of the 
bridge the edges of the concrete are rounded off to meet the surface 
of the adjoining macadam road. 
SUPPLEMENTARY REPORT OF EXPERIMENT MADE AT BOISE, IDAHO, 
1910. 
OIL-GRAVEL MACADAM. 
The original report of this experiment was published in Circular 
No. 94, and reports of annual inspections were given in Circulars 
Nos. 98 and 99, Office of Public Roads, and in U.S. Department of 
Agriculture Bulletin No. 105. The following report covers an inspec- 
tion made on January 2, 1915: | 
