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As the river seemed to describe a big loop, I had left it three days before, seeing plainly by the conformation of the country that we should strike it again sooner or later. We were marching once more by compass. My men, who had no faith whatever in the magnetic needle, were again almost paralysed with fear that we might not encounter the stream again. A thousand times a day they accused me of foolishness in leaving the river, as they said it would have been better to follow its tortuous course--notwithstanding the trouble we had in following it, owing to the dense vegetation near the water--rather than strike once more across country. They were beginning to lose heart altogether, when I told them I could see by the vegetation that we were once more near the water. Anybody accustomed as I am to marching through the forest could tell easily by the appearance of the vegetation some miles before actually getting to a stream.

"Oh dear!" Celia said to herself, "I am sure Freshitt Hall would have been pleasanter than this." She thought of the white freestone, the pillared portico, and the terrace full of flowers, Sir James smiling above them like a prince issuing from his enchantment in a rose-bush, with a handkerchief swiftly metamorphosed from the most delicately odorous petals--Sir James, who talked so agreeably, always about things which had common-sense in them, and not about learning! Celia had those light young feminine tastes which grave and weatherworn gentlemen sometimes prefer in a wife; but happily Mr. Casaubon's bias had been different, for he would have had no chance with Celia.

Silica itself, and the silicates of alumina, of lime, and of magnesia, are practically infusible; the silicates of soda, of potash, and of iron are easily fusible if the base (soda, potash, or oxide of iron) be present in sufficient quantity, and if, in the case of the iron, it is present mainly as lower oxide (ferrous silicate). The addition of lime, oxide of iron, or alkali to silicate of alumina results in the formation of a double silicate of alumina and lime, or of alumina and iron, &c., all of which are easily fusible. Similarly, if to a silicate of lime we add oxide of iron, or soda, or even alumina, a fusible double silicate will be formed. Thus lime, soda, oxide of iron, and clay, are _fluxes_ when properly used; but since lime, clay (and oxide of iron if there be any tendency to form peroxide), are of themselves infusible, any excess of these fluxes would tend to stiffen and render pasty the resulting slag. So, too, soda, which is a very strong base, may act prejudicially if it be in sufficient excess to set free notable quantities of lime and magnesia, which but for that excess would exist in combination as complex fusible silicates. There are many minerals which with but little soda form a glass, but with more yield a lumpy scoriacious mass. There are many minerals, too, which are already basic (for example, calcite), and which, when present, demand either a less basic or an acid flux according to the proportions in which they exist. For purposes of this kind borax, or glass, or clay with more or less soda may be used, and of these borax is by far the most generally useful. An objection to too basic a slag (and a very important one) is the speed with which it corrodes ordinary crucibles. These crucibles, consisting of quartz and clay, are rapidly attacked by lime, soda and bases generally.

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