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All the best stories in the world are but one story in reality--the story of an escape. It is the only thing which interests us all and at all times--how to escape. The stories of Joseph, of Odysseus, of the prodigal son, of the Pilgrim's Progress, of the "Ugly Duckling," of Sintram, to name only a few out of a great number, they are all stories of escapes. It is the same with all lovestories. "The course of true love never can run smooth," says the old proverb, and love-stories are but tales of a man or a woman's escape from the desert of lovelessness into the citadel of love. Even tragedies like those of OEdipus and Hamlet have the same thought in the background. In the tale of OEdipus, the old blind king in his tattered robe, who had committed in ignorance such nameless crimes, leaves his two daughters and the attendants standing below the old pear-tree and the marble tomb by the sacred fountain; he says the last faint words of love, till the voice of the god comes thrilling upon the air: "OEdipus, why delayest thou?"

But what is the object of facilitating the circulation of water in boilers? Why may we not safely leave this to the unassisted action of nature as we do in culinary operations? We may, if we do not care for the three most important aims in steam-boiler construction, namely, efficiency, durability, and safety, each of which is more or less dependent upon a proper circulation of the water. As for efficiency, we have seen one proof in our kettle. When we provided means to preserve the circulation, we found that we could carry a hotter fire and boil away the water much more rapidly than before. It is the same in a steam boiler. And we also noticed that when there was nothing but the unassisted circulation, the rising steam carried away so much water in the form of foam that the kettle boiled over, but when the currents were separated and an unimpeded circuit was established, this ceased, and a much larger supply of steam was delivered in a comparatively dry state. Thus, circulation increases the efficiency in two ways: it adds to the ability to take up the heat, and decreases the liability to waste that heat by what is technically known as priming. There is yet another way in which, incidentally, circulation increases efficiency of surface, and that is by preventing in a greater or less degree the formation of deposits thereon. Most waters contain some impurity which, when the water is evaporated, remains to incrust the surface of the vessel. This incrustation becomes very serious sometimes, so much so as to almost entirely prevent the transmission of heat from the metal to the water. It is said that an incrustation of only one-eighth inch will cause a loss of 25 per cent in efficiency, and this is probably within the truth in many cases. Circulation of water will not prevent incrustation altogether, but it lessens the amount in all waters, and almost entirely so in some, thus adding greatly to the efficiency of the surface.

You may today read histories of Europe written by men of worldwide and pre-eminent reputation, professing to tell the story of the development of human society, in which whole volumes will be devoted to the effect of a particular campaign or military alliance in influencing the destinies of a people like the French or the German. But in those histories you will find no word as to the effect of such trifles as the invention of the steam engine, the coming of the railroad, the introduction of the telegraph and cheap newspapers and literature on the destiny of those people; volumes as to the influence which Britain may have had upon the history of France or Germany by the campaigns of Marlborough, but absolutely not one word as to the influence which Britain had upon the destinies of those people by the work of Watt and Stephenson.

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