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The Achaean exiles, whose numbers were now reduced from 1000 to 300, landed in Greece (B.C. 151) with feelings exasperated by their long confinement, and ready to indulge in any rash enterprise against Rome. Polybius, who had returned with the other exiles, in vain exhorted them to peace and unanimity, and to avoid a hopeless struggle with the Roman power. Shortly afterward an adventurer laid claim to the throne of Macedonia (B.C. 149). He was a man of low origin called Andriscus, but he pretended to be the son of Perseus, and assumed the name of Philippus. At first he met with some success, and defeated the Roman Praetor Juventius, but, after reigning scarcely a year, he was conquered and taken prisoner by Q. Metellus.

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.

Sulphide of iron formed during an assay will remain diffused through the slag, instead of fusing into a button of regulus, if the slag contain sulphide of sodium. The same is true of other sulphides if not present in too great a quantity, and if the temperature is not too high. _Speises_ are compounds of a metal or metals with arsenic. They are chiefly of interest in the metallurgy of nickel, cobalt, and tin. They are formed by heating the metal or ore in covered crucibles with arsenic and, if necessary, a reducing agent. The product is fused with more arsenic under a slag, consisting mainly of borax. They are very fusible, brittle compounds. On exposure to the air at a red heat the arsenic and the metal simultaneously oxidize. When iron, cobalt, nickel, and copper are present in the same speise, they are eliminated in the order mentioned. _Slags_ from which metals are to be separated should not be too acid; at least, in those cases in which the metal is to be reduced from a compound, as well as separated from earthy impurities. Where the object is simply to get a button of metal from a substance in which it is already in the metallic state, but mixed with dross (made up of metallic oxides, such as those of zinc or iron), from which it is desired to separate it, an acid flux like borax is best; or, if the metal is easily fusible, and there would be danger of loss of metal by oxidation or volatilising, it may be melted under a layer of resin or fat. Common salt is sometimes used with a similar object, and is often useful. Under certain conditions, however, it has a tendency to cause the formation of volatile chlorides with a consequent loss of metal.

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