18 G. G. Hubbard — The Evolution of Commerce. 



water power, for by the electric wire the power may be brought 

 to the house of the operative, and we may again see the private 

 workman supersede the factory operative. A few cars and small 

 vessels are moved by electricity — the forerunner of greater things. 

 We know little of this new agency, but its future growth must be 

 more rapid and more wonderful than that of steam. 



The secretary of the Smithsonian Institution (Mr. Langiey) 

 tells us that " before the incoming of the twentieth century, aerial 

 navigation will be an established fact." 



" The deeper the insight we obtain into the mysterious work- 

 ings of- nature's forces," says Siemens, " the more we are con- 

 vinced that we are still standing in the vestibule of science ; that 

 an unexplored world still lies before us ; and however much we 

 may discover, we know not whether mankind will ever arrive at 

 a full knowledge of nature." 



