DUST PREVENTION AND EOAD PRESERVATION, 1916. 47 
In December Biscayne Drive and all the experimental sections 
received a top-dressing of light crude oil and coarse beach sand for 
the purpose of keeping down the dust during the tourist season. On 
December 22, when the road was last inspected, section 3 could hardly 
be distinguished from the surface-treated road adjacent, but it was 
evident that no serious break had occurred. Sections 4 and 5 were 
distinguishable by the numerous particles showing on the surface. 
Section 6 was in perfect condition, with the exception of the new 
surface over the sewer. 
RESUME of previous reports. 
These experiments are located on the Biscayne Drive about 2 miles 
north of Miami, Fla. The road connects Miami with Fort Lauderdale, 
Palm Beach, and other cities along the east coast, and is subjected to 
a fairly heavy mixed traffic. The purpose of these experiments was 
to obtain a satisfactory and permanent surface from the use in con- 
struction of a selected bituminous binder with the native coralline 
rock. Table 50 indicates the method of construction of the experi- 
mental sections and shows their condition at the time of several 
inspections since construction. The tabulation shown has been pre- 
pared from reports of inspections made by this office, published in 
Bulletins Nos. 105, 257, and 407, U. S. Department of Agriculture. 
