A.The space between the external and internal fire boxes forms a water space, which must be stayed every 4-1/2 or 5 inches by means of copper or iron stay bolts, screwed through the outer fire box into the metal of the inner fire box, and securely riveted within it: iron stay bolts are as durable as copper, and their superior tenacity gives them an advantage.

In France, clothes are almost as durable as furniture, and the gaiety which twenty or thirty years ago we were complaisant enough to admire is far from being expensive.

Plumbago-marks, if not removed by rubbing, are even more durable than ink; because plumbago is an organic, insoluble substance, not subject to the chemical changes which moisture, the atmosphere, and fluids accidentally spilled, and solvents purposely applied, make in the various kinds of ink which are known to us.

From things my parents chiefly taught me my first lessons, and they have been as durable as life.

In fact, the greater portion of our cotton manufactures sold at Singapore is consumed in the less civilized parts of the Indian Archipelago, where the natives prefer cheap goods and gaudy patterns; while the people of Java, Celebes, etc. prefer their own or Indian manufactures, which, although dearer, are far more durable than ours.

Hence plated goods are now sought all over the world, and, if fairly used, are nearly as durable as silver itself.