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The commonest form of the element, which in itself is very far from common, is what is known to chemistry as chloride of radium which is a combination of chlorin and radium. This is a grayish white powder, somewhat like ordinary coarse table salt. To get enough to weigh a single grain requires the treatment of 1,200 pounds of pitchblende. The second form of radium is as a bromide.
"It may be well to keep in mind that when the druggist says potash he means potassium hydroxid, KOH, a compound of potassium, hydrogen, and oxygen, as the name indicates." "You mentioned the word chlorin," said Mr. Thornton. "That is another element?" "Yes, that is a very common element. Ordinary table salt is sodium chlorid: NaCl.
The kainit furnishes both potassium and magnesium in soluble form and it also contains sulfur and chlorin. As soon as you can provide plenty of decaying organic matter you will probably discontinue the use of both kainit and acid phosphate.
Sodium is called natrium in Latin, and Na is the symbol used in English to be in harmony with all other languages, for practically all use the same chemical symbols. Sodium and potassium are very similar elements in some respects, and in the free state they are very peculiar, apparently taking fire when thrown into water. Chlorin in the free state is a poisonous gas.
I still remember that the dative of indirect object is used with most Latin verbs compounded with ad, ante, con, in, inter, ob, post, pre, pro, sub, and super, and sometimes circum; but it would have been just as easy for me to have learned forty years ago that the essential elements of plant food are carbon, oxygen, and hydrogen; nitrogen, phosphorus, and potassium; magnesium, calcium, iron and sulfur; and possibly chlorin; and I am sure that the culture of Greek roots and a knowledge of Latin compounds have been of less value to me during the forty years than the culture of alfalfa roots and even a meager knowledge of plant-food compounds have been during the last three years.
He took from his pocket a slender box or tube of light wood, removed the screw cap, and drew out a glass-stoppered bottle. "This bottle contains hydrochloric acid," said Percy. "It is often incorrectly called 'muriatic acid. It consists of two elements, hydrogen and chlorin, from which its name is derived. But you are perhaps already familiar with the chemical elements."
I gasped, hoarsely, as we all imitated his every action. "Chlorin gas," he rasped back, "the same gas that overcame Granville Barnes. These masks are impregnated with a glycerin solution of sodium phosphate. It was chlorin that destroyed the red coloring matter in Barnes's blood. No wonder, when this action of just a whiff of it on us is so rapid. Even a short time longer and death would follow.
"Entirely synthetic," Satrazon made answer, "except for the sodium chloride necessary. As you already know, sodium and chlorin are very rare throughout our system, therefore the force upon the food-supply took from your vessel the amount of salt required for the formula.
It is of value if there is edema in nephritis; it is of doubtful value in heart disease; it is rarely of value in diabetes insipidus; and in epilepsy its value consists probably in allowing the bromid that may be administered to have better activity in smaller doses, the bromin salt being substituted in the metabolism for the chlorin salt.
We have great abundance of all the heavy metals, but the lighter metals are rare. Sodium and chlorin are the rarest of all known elements. Its immense value is due, not to its rarity, but to the fact that it is an indispensable component of the controlling instruments of our wireless power stations and that it is used as a catalyst in the manufacture of our hardest metals.
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