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Concrete is also used for stucco work, that is, for plastering the outside of buildings. If the building to be stuccoed is of brick or stone, the only preparation needed is to clean it and wet it; then put on the plaster between one and two inches thick. A wooden house must first be covered with two thicknesses of roofing-paper, then by wire lathing.

Corydon too was interested in these discoveries, and became skilled at holding weather-boards while her husband nailed them, and at helping to unroll and measure roofing-paper, and climbing up the ladder and holding it in place.

Some of them are used for oiling machinery; tar is used for dyes; naphtha dissolves resin to use in varnish; benzine is the great cleanser of clothes, printers' types, and almost everything else; gasoline runs automobiles, motors, and many sorts of engines; paraffin makes candles, seals jelly glasses, covers the heads of matches so that they are no longer spoiled by being wet, and makes the ever-useful "waxed paper"; printers' ink and waterproof roofing-paper both owe a debt to petroleum.

Its surface is covered with large masses of floating crust, black and smooth, like leather or roofing-paper, and between these masses, or islands, the molten lava shows in broad, vivid lines. It is never quiet. When not actually boiling, there is a slow circulatory movement, and the great flakes of black crust, suggesting scum, drift across from one end to the other and are drawn under the rocks.

There were two windows a triple one in the end wall of the main room, and a double one in the kitchen. For the covering of the roof we took out roofing-paper, and for the floor linoleum. In the main room there were two air-pipes, one to admit fresh air, the other for the exhaust. There were bunks for ten men in two stages, six on one wall and four on the other.

It was to be "weather-boarded", and roofed with paper, instead of shingles this being so much cheaper. Corydon heard with dismay that it would be necessary to paint this roofing-paper black; and Thyrsis, by way of compensation, agreed that the weather-boards should have some "natural finish", instead of common paint.

Before long he even learned to start them himself; and a most diverting sight it was to see this twenty-two-months old youngster driving nails like an infant Hercules. For the fastening of the roofing-paper they used little circular plates of tin called "cotterels"; and these also Cedric must learn to use.