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Updated: June 19, 2025
The instrument is then removed to the dark room, and the plates developed by immersing them all at once in a solution consisting of four parts potassium oxalate and one part ferrous sulphate. After ten minutes they are removed, fixed, and dried. Their readings are then noted, and compared with those obtained with the silver chloride.
"Pure potassium chlorid contains only the two elements, potassium and chlorin." "But didn't you say that it was guaranteed to contain potash and that potash is part oxygen? Now you say it contains only potassium and chlorin." "Yes, I am sorry to say, that this is one of those blunders of our semi-scientific ancestors for which we still suffer.
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.
"I will just make a few scratches on this fourth sheet of paper so. It leaves no mark. But it has the remarkable property of becoming red in vapour of sulpho-cyanide. Here is a long-necked flask of the gas, made by sulphuric acid acting on potassium sulpho-cyanide. Keep back, Dr. Waterworth, for it would be very dangerous for you to get even a whiff of this in your condition. Ah!
Potassium cyanide, KCN, is a white, crystalline compound, and could hardly be used in a hypodermic syringe save in solution, in which condition it would not have been sufficiently poisonous to have served my purpose. At this reply many of the audience exchanged approving glances.
As an example, we may take the determinations of the melting-points of mixtures of potassium and sodium nitrate by M. Maumené. From this diagram we should be led to expect a eutectic mixture, since the curve dips below a horizontal line passing through the melting-point of the more fusible of its constituents. From our curve we should expect a eutectic mixture with about 35 per cent.
The difficulty is that the stragglers, organized under fantastic names in pretentious associations, or lurking in solitary dens behind doors left ajar, make no real contributions to the art of healing. When they bring forward a remedial agent like chloral, like the bromide of potassium, like ether, used as an anesthetic, they will find no difficulty in procuring its recognition.
It should be noted, too, that certain crops which are exceedingly important for economic systems of permanent agriculture require very large amounts of calcium as plant food. Thus a four-ton crop of clover hay takes about 120 pounds of calcium from the soil, or the same amount as of potassium; while such a crop of alfalfa requires about 145 pounds of calcium, but only 96 pounds of potassium.
Besides the characteristic substances of these three classes, protoplasm contains certain other chemical compounds, like the various salts of sodium, chlorine, magnesium and potassium, and a few others, which bring the list of chemical elements to the number twelve.
The Molokani are said to have obtained this name from taking milk and butter during fast times when they are forbidden to the Orthodox, but more probably from the fact of their having colonies on either bank of the river Molochnaia, so called from the whiteness of its waters, due to potassium salts. They are very closely akin to the Dukhobortsy, of which sect they are an offshoot.
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