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He went to bed with dreams of vast new areas watered for summer rice, of pumping-stations lifting millions of cubic metres of water per day; of dykes to be protected by bulrushes and birriya weeds; of great desert areas washed free of carbonates and sulphates and selling at twenty pounds an acre; of a green Egypt with three crops, and himself the Regenerator, the Friend of the Fellah.
Certain salts for example, the sulphates of zinc and of calcium, barium platino-cyanide, tungstate of calcium, and the double sulphate of uranyle and potassium are more active than glass, and even emit the rays after exposure to ordinary light, if not also in the dark.
A drop of the oxidized solution should be tested on a watch-glass with potassium ferricyanide, to insure a complete oxidation. The ionic changes which are involved in this oxidation are perhaps most simply expressed by the equation Even with this precaution the entire absence of sulphates from the first iron precipitate is not assured.
At ordinary temperatures and under ordinary conditions boric acid is a very weak acid, but like silicic and some other acids, its relative powers of affinity and combination become very much changed at high temperatures; thus, fused and strongly heated boric acid can decompose carbonates and even sulphates, and yet a current of so weak an acid as hydrogen sulphide, passed through a strong solution of borax, will decompose it and set free boric acid.
It should be noted that, in general, the changes occurring at the cathode are reductions, while those at the anode are oxidations. For analytical purposes, solutions of nitrates or sulphates of the metals are preferable to those of the chlorides, since liberated chlorine attacks the electrodes.
There are two springs, one containing more salt, lime, and magnesia sulphates than the other. In the season, this esplanade in fact, the entire front of the cliffs is full of visitors, while before it are rows of little boxes on wheels, the bathing-houses that are drawn into the water.
Sulphates of lime and magnesia are its principal solid ingredients, with chloride and a little iodide of lithium and an organic compound having the odor of blackberries. The mountains about Innsbruck in the Tyrol, as well as other parts of the Alps, present the singular phenomenon of a climate more moderate at a considerable elevation than in the valleys. Prof.
When zinc amalgam is used, alkalies would, of course, be detrimental. When no other water than that from the mine is available, difficulties often arise owing to the impurities it contains. These are various, but among the most common are the soluble sulphates, and sometimes free sulphuric acid evolved by the oxidisation of metallic sulphides.
I have observed in general, that the waters act more easily on the carbonates and the sulphates of lime of secondary mountains than on the transition limestones, which have a considerable mixture of silex and carbon. On examining the internal structure of the stalactites which line the walls of caverns, we find in them all the characters of a chemical precipitate.
The decomposition of the earthy and alkaline sulphates, and their transition to the state of sulphurets, may no doubt favour this disengagement in many littoral and marine plants; for instance, in the fuci: but I am rather inclined to think that the rhizophora, the avicennia, and the conocarpus, augment the insalubrity of the air by the animal matter which they contain conjointly with tannin.
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