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During Scipio's absence in Africa a formidable insurrection had broken out in Spain; but on his return it was speedily put down, and terrible vengeance was inflicted upon the town of Illiturgis, which had taken the principal share in the revolt. Scarcely had this danger passed away when Scipio was seized with a dangerous illness. Eight thousand of the Roman soldiers, discontented with not having received their usual pay, availed themselves of this opportunity to break out into open mutiny; but Scipio quelled it with his usual promptitude and energy. He crushed the last remains of the insurrection in Spain; and to crown his other successes, Gades at last surrendered to the Romans. Mago had quitted Spain, and crossed over into Liguria, to effect a diversion in favor of his brother Hannibal, and there was therefore now no longer any enemy left in Spain.

~Indirect Titration.~--The action of permanganate of potash upon a ferrous solution is one of oxidation, hence it is evident that if any other oxidising agent is present it will count as permanganate. In such a case the titration can be used (indirectly) to estimate the quantity of such oxidising agent, by determining how much less of the permanganate is used. For example, suppose that 1 gram of iron dissolved in sulphuric acid requires 100 c.c. of standard permanganate to fully oxidise it, but that the same amount of iron only requires 35.6 c.c. of the same standard permanganate if it has been previously heated with 0.5 gram of black oxide of manganese. Here it is evident that 0.5 gram of black oxide does the work of 64.4 c.c.[4] of the permanganate solution, and that these quantities are equivalent; moreover, if 64.4 c.c. correspond with 0.5 gram, then 100 c.c. correspond with 0.7764 which is the standard. On theoretical grounds, and by a method of calculation which will be explained further on (under the heading "Calculations from Formulæ"), it can be found that if the standard for iron is 1 gram, that for the black oxide will be 0.7764 gram.

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