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~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.

He was sick, too, at the time, with an intermittent fever. The paroxysm returned once in three or four days, leaving him in tolerable health during the interval. He went first into the country of the Sabines, northeast of Rome, where he wandered up and down, exposed continually to great dangers from those who knew that he was an object of the great dictator's displeasure, and who were sure of favor and of a reward if they could carry his head to Sylla He had to change his quarters every day, and to resort to every possible mode of concealment. He was, however, at last discovered, and seized by a centurion. A centurion was a commander of a hundred men; his rank and his position therefore, corresponded somewhat with those of a _captain_ in a modern army. Caesar was not much disturbed at this accident. He offered the centurion a bribe sufficient to induce him to give up his prisoner, and so escaped.

Independent of respect paid to those in authority, rank is still reverenced in Fiji. Once acting under the kind permission and advice of our generous friend Mr. Allardyce, the colonial secretary, and accompanied by my ship-mates Drs. Charles H. Townsend, and H. F. Moore, I went upon a journey of some days into the interior of Viti Levu, our guide and companion being Ratu Pope Seniloli, a grandson of king Thakombau, and one of the high chiefs of Mbau. Upon meeting Ratu Pope every native dropped his burdens, stepped to the side of the wood-path and crouched down, softly chanting the words of the tame, muduo! wo! No one ever stepped upon his shadow, and if desirous of crossing his path they passed in front, never behind him. Clubs were lowered in his presence, and no man stood fully erect when he was near. The very language addressed to high chiefs is different from that used in conversation between ordinary men, these customs being such that the inferior places himself in a defenceless position with respect to his superior.

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