46 BULLETIN 105, U. S. DEPARTMENT OF AGRICULTURE. 
SUPPLEMENTARY REPORT OF AN EXPERIMENT MADE AT BOWLING 
GREEN, KY., 1907. 
KENTUCKY ROCK ASPHALT. 
The original report of this experiment was published hi Circular 
No. 89 and reports of annual inspections are given in Circulars Nos. 
90, 92, 94, 98, and 99. The inspection on which the following report 
is based was made on January 5, 1914: 
For a distance of 50 feet from the west end of the section the north 
half of the road is badly worn and more than 50 per cent of the 
asphaltic surface is gone. The south half of the road is in fair con- 
dition. 
In the remaining length of the section there are 33 depressions 
from 1 to 3 feet in diameter and from 1 to 3 inches in depth, which 
indicate partial or complete failure of the asphaltic surface. How- 
ever, as a whole, this portion of the road is in a very fair condition, 
but it would appear that unless the surface is soon repaired the entire 
experiment will materially fail within the next year. Disintegration 
has been quite rapid since a mid-year inspection made on July 8, 
1913. 
O 
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WASHINGTON : GOVERNMENT PRINTING OFFICE : 1914 
