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Updated: May 3, 2025
Can we believe that any power, acting for a time short of infinity, could have denuded the granite over so many thousand square leagues? On a point not far from the city, where a rivulet entered the sea, I observed a fact connected with a subject discussed by Humboldt. The layer is of extreme thinness; and on analysis by Berzelius it was found to consist of the oxides of manganese and iron.
Add 1-2 cc. of freshly prepared starch solution and titrate to the disappearance of the blue color. As a strong acid it will also dissolve the copper from carbonate ores. The hydrochloric acid is added to dissolve oxides of iron and to precipitate silver and lead. The sulphuric acid displaces the other acids, leaving a solution containing sulphates only.
Hence, when volcanic fissures are watched at night, faint lambent flames are frequently seen playing over them, and sometimes these flames are brilliantly colored, through the presence of small quantities of certain metallic oxides.
After numerous experiments that need not be described in detail, coarsely pulverized carbon was selected as the best means for maintaining a variable resistance and at the same time as the most available substance for the reduction of oxides.
It is true we do not find oxides, carbonates, or bromides of gold in Nature, nor can we feel quite sure that gold now exists naturally as a sulphide, chloride, or silicate, though the presumption is strongly that it does. If so, the deposition of the gold may be ceaselessly progressing. Generally reef gold is finer as to size of the particles, and, as a rule, inferior in quality to alluvial.
'Then tell someone that I don't wish to see him. Well-trained servant, Edwards, he walked off with the message as decorously as you please. And then I thought there was an end, but there wasn't. I was regulating the valve of a cylinder in which I was fusing some oxides when, once more, someone touched me on the shoulder. Without turning I took it for granted it was Edwards back again.
When you come to handle life and death as your daily business, your memory will of itself bid good-by to such inmates as the well-known foramina of the sphenoid bone and the familiar oxides of methyl-ethylamyl-phenyl-ammonium.
An analysis of the Nile alluvium, which has accumulated in the course of ages to a thickness of from three to four feet above the old river-bed, shows that it contains a considerable percentage of such fertilising substances as carbonate of lime and magnesia, silicates of aluminum, carbon, and several oxides. Where the water has to be raised to higher levels, two processes are used.
Liebig recognised, in the known chemical properties of the oxides of iron, laws which, if followed out deductively, would lead to the prediction of the precise series of phenomena which respiration exhibits. There are two oxides of iron, a protoxide and a peroxide.
And then when we come to the oxides, acids, and other binary compounds, we see that in many cases the elements of which they are formed, when brought into the presence of one another under favourable conditions, unite with violence; and that many of their unions cannot be dissolved by heat alone.
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