42 BULLETIN 257, U. S. DEPARTMENT OF AGRICULTURE. 
SUPPLEMENTARY REPORT OF EXPERIMENTS MADE AT NEWTON, 
MASS., 1908. 
ASPHALTIC PREPARATIONS, TAR PREPARATIONS, RESIDUAL OIL, AND MOLASSES- 
| OIL-LIME. 
The original report of these experiments was published in Circu- 
lar No. 90, and reports of annual inspections were given in Circulars 
Nos. 92, $4, 98, and 99, Office of Public Roads, and in U.S. Depart- 
ment of Agriculture Bulletin No. 105. No repairs have been made 
during the past year, and the followimg report covers an inspection 
made on October 5, 1914. 
EXPERIMENTS Nos. 1, 2,3, 4, 5, 6, aND 7 (ASPHALTIC PREPARATION—MIXING MerHop), 
The first four of these sections, which have been reported as 
badly worn and in need of resurfacing, have continued to deteriorate 
so that almost none of the original surfacing shows. All of these 
sections are badly rutted and fuil of holes, with the exception of one 
piece of road, about 30 feet in length, at or near the beginning of 
experiment No. 3. This is in practically perfect condition for the 
entire width of the roadway. 
Experiment No. 5 in its entirety is now in about the same condition 
as the first four experiments and is in need of resurfacing. 
Experiment No. 6 continues to be in very good condition. 
Experiment No. 7 contains about 20 places varying from depres- 
sions to holes, with about 14 holes which vary from 6 inches in diame- 
ter to an area of 4 square feet. It is evidently deteriorating rapidly 
through the “cupping” action. The three holes reported in Circular 
No. 99 as needing patching now show only traces of the binder, but 
there is a good mechanical bond in the foundation stone. 
EXPERIMENT No. 8 (RESIDUAL PETROLEUM—MIxING METHOD). 
| - The eight small holes which were reported in U. S. Department of 
Agriculture Bulletin No. 105 have developed so that they vary from 
6 inches in diameter to an area of 2 square feet. On this section there 
are indications of rutting and raveling near each quarter-point. The 
section should be patched and surface-treated if further deterioration 
is to be prevented, otherwise it seems probable that an inspection next 
year will show that 1t will need resurfacing. At the westerly side of 
Langdon Street there is evidence of a trench having been dug across 
the entire roadway in order to supply a fire hydrant, and the old 
material has been thrown back without any attempt at surface 
patching. 
EXPERIMENTS Nos. 9 anp 10 (REFINED WaTER-GAS TAR—Mixtnc METHOD). 
These experiments appeared to be in practically as perfect condition 
as reported in U. S. Department of Agriculture Bulletin No. 105. 
