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"The results of this chemical investigation show that the chief advantages of this system of putrefaction are: "First. The active agent, hydrated ferrous oxide, is prepared within the sewage itself as a flocculent precipitate. "Second. Hydrated ferrous oxide is a deodorizer. "Third.
The writing on old and faded documents may be restored, by chemical treatment, turning the iron salt still remaining into ferrous sulphate. A process which will restore the writing temporarily is as follows: A box four or five inches deep and long and broad enough to hold the document, with a glass, is needed.
Toward the poised Boise Roger steered. Within range, he flung out a weapon new-learned and supposedly irresistible to any ferrous thing or creature, the red converter-field of the Nevians.
A delicate test for the acid, free or in combination, is to dissolve in the suspected fluid some crystals of ferrous sulphate, and then to gently pour down the test-tube some strong sulphuric acid. Where the two liquids meet, if nitric acid be present, a reddish-brown ring will be formed. It turns the skin bright yellow, and does the same with woollen clothes, from the formation of picric acid.
Examine and burn a piece of magnesium ribbon, noting the white compound of magnesium oxide which is formed. Iron. Examine pieces of the metal and also some of its compounds, as ferrous sulphate, ferric chloride, and ferric oxide or iron rust. Sodium. Drop a piece of the metal on water and observe results. Sodium decomposes water.
The geologists were interested, and we others learnt something of olivines, green in crystal form or oxidized to bright red, granites or granulites or quartzites, hornblende and feldspars, ferrous and ferric oxides of lava acid, basic, plutonic, igneous, eruptive schists, basalts &c. All such things I must get clearer in my mind. Tuesday afternoon a cold S.E. wind commenced and blew all night.
Diamond, sir, in extraordinary evidence! in conjunction with specular iron ore, commonly called the red haematite, and the ferrous carbonate, or spathic iron. You see her, sir? you see her?" Hogarth whispered: "Yes".
At the positive pole, hypochlorite of iron seems to be formed at first, but this is quickly changed into a protochloride, and as at the negative pole an alkaline reaction takes place, the iron salt is precipitated in the form of the ferrous hydrated oxide, together with the organic matters in suspension and solution.
If this last previous test shows a blue tint in comparison with the fresh mixture, the end-point has not been reached; if no difference can be noted the reaction is complete. Should the end-point be overstepped, a little more of the ferrous solution may be added and the end-point definitely fixed.
The color of these villages in Lorraine is rather lovely, for the walls of the houses, built of the local buff-yellow stone and ferrous sand, are of a warm, brown tone that goes well with the roofs of claret-red tile and the brown landscape. A glorious sky of silvery white cloud masses, pierced with sunlight and islanded with soft blue, shone over the soldier village.
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