Up to 1840 there were no iron bridges in the United States except suspension bridges, in which iron links were used in the cables and suspenders, the floor sys tem being of wood. The first bridge in America consisting of iron throughout was built in 1840 by Earl Trumbull over the Erie Canal, in the village of Frankfort, N. Y.

The drill frequently penetrates hundreds of feet of solid salt in drilling wells for petroleum. The salt is often as clear as glass, as hard as rock and is frequently intensified with shale, as is frequently the case with coal. In the region where there is a stratum of salt above the petroleum there is often salt water in the petroleum stratum. Especially is this the case where the material between the surface and the oil stratum is mainly limestone. The latter material, being very unyielding, its cleavage allows an easy access of water, often to a great deptn ; while clayey shales, being more plastic, often exclude all water from penetrating more than a hundred feet or so from the surface.

Francis J. McCarty, a 17-year-old San Francisco youth, believes that he has discovered the secret of transmitting the sounds of the human voice through the air without the aid of wires. It is said that experiments made on the ocean beach with apparatus went far to prove that the problem of wireless telephony is solvable, if not actually solved already.

That the phonograph is a popular means of enter tainment is obvious to everybody's ear, but few will fail to be surprised at the fact that the output of Edison records last year was fourteen millions. The company is now forty thousand machines behind its orders.

Many, many years ago, salt was so hard to obtain, but so necessary to have, that Roman soldiers were paid part of their wages in salt. Now, the Latin word for salt is sal, and from that came the word salarium, meaning salt money. Finally the soldiers were paid only in money, but the term salarium was still used to designate these wages. From this old Latin word comes our English word salary. Do you see, then, why we say of a worthless fellow that he "is not worth his salt?"

In answering the question, " How soon will electricity replace steam as the motive power of steam railroads?" it must be remembered, says the "Railway Critic, " that electricity only shows an economy over steam locomotives under certain special conditions, among which are those that the distance should be comparatively short and the traffic dense. During the next few years we are likely to see the adoption of electricity as a motive power in tne railroad terminals of the great cities, and, perhaps, between some of the great cities, such as between New York and Philadelphia, but the bulk of the long-distance hauling and and the freight traffic is likely to be done by steam locomotives for some time to come.