A marble quarry is even more interesting than a granite quarry. If you stand on a hill in a part of the country where marble is worked, you will see white ledges cropping out here and there. The little villages are white because many of the houses are built of marble. Then, too, there are great marble quarries flashing in the sunshine. Sometimes a marble quarry is chiefly on the surface. Sometimes the marble stretches into the earth, and the cutting follows it until a great cavern is made, perhaps two or three hundred feet deep. A roof is often built to keep out the rain and snow. It keeps out the light, too, and on rainy days the roof, together with the smoke and steam of the engines, makes the bottom of the quarry a gloomy place. Everywhere there are slender ladders with men running up and down them. There are shouts of the men, clanking of chains, and puffing of locomotives. Marble is cut out in somewhat the same way as granite, but a valuable machine called a "channeler" is much used. This machine runs back and forth, cutting a channel two inches wide along the ends and back and sometimes the bottom of the block to be taken out. Marble is so much softer than granite that it is far more easy to work. Cutting it is a simple matter. The saw, which is a smooth flat blade of iron, swings back and forth, while between it and the marble sand and water are fed. It does not exactly _cut_, but rubs, its way through. The round holes in the tops of washstands are cut by saws like this, only bent in the form of a cylinder and turned round and round, going in a little deeper at each revolution. A queer sort of saw is coming into use. It is a cord made of three steel wires twisted loosely together. This cord is stretched tightly over pulleys and moves very rapidly. Every little ridge of the cord strikes the stone and cuts a little of it away.