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Corona: shafts meeting to form. Auroras are sometimes accompanied by magnetic storms, but not always, and vice versa in general significant signs of some connection possible common dependents on a third factor. The phenomenon further connects itself in form with lines of magnetic force about the earth. Two theories enunciated: Arrhenius.
M. Arrhenius was led to adopt this hypothesis by the examination of experimental results relating to the conductivity of electrolytes. In order to interpret certain facts, it has to be recognized that a part only of the molecules in a saline solution can be considered as conductors of electricity, and that by adding water the number of molecular conductors is increased.
It is true that the discovery of radio-activity has disclosed a new source of energy within the atoms themselves, and there are scientific men, like Professor Arrhenius, who attach great importance to this source.
The distinction of types rests on a solid basis of fact, but probably depends upon differences rather in the mode of action than in the kind of substance acted upon. Suggestive sketches of electrical and "light-pressure" theories of comets have been published respectively by Mr. Fessenden of Alleghany, and by M. Arrhenius at Stockholm.
Kindly tell me of any one who is working upon the application of electricity to stimulating agricultural growth-especially here on the Coast. A friend who has done some work in this line seeks to interest me. I have seen notices of this work, and have read of Professor Arrhenius stimulating the mental activity of children, etc., but I desire more definite information, if possible.
Professor Arrhenius explains, for instance, the polar auroras by the action of similar corpuscules emitted by the sun. In other phenomena we seem indeed to be confronted by an emission, not of negative electrons, but of positive ions. Thus, when a wire is heated, not in vacuo, but in a gas, this wire begins to electrify neighbouring bodies positively.
We are now confronted by the fascinating theory of Arrhenius of an infinite universe filled with vital spores, wafted about by radio-activity, and beginning their upward course of evolution wherever they find a kindly soil on which to rest.
By the hypothesis of Arrhenius every planet that has an atmosphere must have a Zodiacal Light attending it, but the phenomenon is too faint for us to be able to see it in the case, for instance, of Venus, whose atmosphere is very abundant.
This increase, too, though rapid at first, soon becomes slower, and approaches a certain limit which an infinite dilution would enable it to attain. The opposition of a large number of chemists and physicists to the ideas of M. Arrhenius was at first very fierce. It must be noted with regret that, in France particularly, recourse was had to an arm which scholars often wield rather clumsily.
Arrhenius himself discovered this curious relation of auroral frequency to the position of the moon north or south of the equator, and he explains it in this way.
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