1 82 THE POPULAR SCIENCE MONTHLY 



ceeds from Westminster to the city. This serves as a striking evidence 

 of the ability of Trinidad asphalt to resist dampness and to carry heavy 

 travel in such a climate and in such a city as London, without deterio- 

 ration. 



I may further illustrate the uses of Trinidad and Bermudez asphalt 

 by citing bituminous broken stone surfaces which have been constructed 

 with these asphalts in Massachusetts and in the State of New York, 

 which have been in use for at least three years, and have given the 

 greatest satisfaction, the most striking feature of these roads being that 

 the bituminous binding material is not drawn to the surface by the hot 

 summer sun, but remains in the road where it is placed, with the great- 

 est stability. Surfaces of this kind have furnished the most satisfactory 

 service tests which are at present available, of a bituminous broken 

 stone construction. 



