Chamberss Edinburgh Journal, No. 455 | Page 6

is clear from the difference in our feelings in dry and wet weather: it has been supposed, however, that the effects on the nervous system are not produced by an accumulation of positive or of negative electricity, but by the combination of the two producing dynamic electricity. While these points are undergoing discussion, we have an opportunity of bringing before our readers the results of investigations bearing on the general question.
Most persons are aware of the fact, that a peculiar taste follows the application of two different metals to the tongue in a popular galvanic experiment. This taste is caused by the azotic acid formed from the oxygen and azote of the atmosphere. An electric discharge, too, is accompanied by a smell, which smell is due to the presence of what is called ozone; and not long ago M. Schoenbein, of Basel, the inventor of guncotton, discovered ozone as a principle in the oxygen of the atmosphere; and it is considered to be the active principle of that universal constituent. Later researches have brought out a striking analogy between the properties of ozone and chlorine, and have led to conclusions as to the dangerous effect which the former may produce, in certain cases, on the organs of respiration. Some idea of its energy may be formed from the fact, that mice perish speedily in air which contains one six-thousandth of ozone. It is always present in the atmosphere in a greater or lesser degree, in direct relation with the amount of atmospheric electricity, and appears to obey the same laws in its variations, finding its maximum in winter and its minimum in summer.
Ozone, in scientific language, is described as 'a compound of oxygen analogous to the peroxide of hydrogen, or, that it is oxygen in an allotropic state--that is, with the capability of immediate and ready action impressed upon it.' Besides being produced by electrical discharges in the atmosphere, it can be obtained artificially by the passing of what is called the electrical brush into the air from a moist wooden point, or by electrolyzed water or phosphorus. The process, when the latter substance is employed, is to put a small piece, clean scraped, about half an inch long, into a large bottle which contains just so much of water as to half cover the phosphorus, and then closing the mouth slightly, to guard against combustion, to leave it standing for a time in a temperature of about 60 degrees. Ozone soon begins to be formed, as shewn by the rising of a light column of smoke from the phosphorus, which, at the same time, becomes luminous. In five or six hours, the quantity will be abundant, when the bottle is to be emptied of its contents, washed out, and closed for use and experiment.
Whichever way the ozone be produced, it is always identical in its properties; and these are described as numerous and remarkable. Its odour is peculiar, resembling that of chlorine, and, when diluted, cannot be distinguished from what is called the electric smell. When largely diffused in atmospheric air, it causes unpleasant sensations, makes respiration difficult, and, by acting powerfully on the mucous membranes, produces catarrhal effects; and as such air will kill small animals, it shews that pure ozone must be highly injurious to the animal economy. It is insoluble in water, is powerfully electromotive, and is most strikingly energetic in numerous chemical agencies, its action on nearly all metallic bodies being to carry them at once to the state of peroxide, or to their highest point of oxidation; it changes sulphurets into sulphates, instantaneously destroys several gaseous compounds, and bleaches indigo, thus shewing its analogy with chlorine.
In proceeding to the account of his experiments, M. Schoenbein shews, that gases can be produced by chemical means, which exercise an oxidizing influence of a powerful nature, especially in their physiological effects, even when diffused through the atmosphere in very minute quantities: also, that owing to the immense number of organic beings on the earth, their daily death and decomposition, an enormous amount of gases is produced similar to those which can be obtained by artificial means; and besides these, a quantity of gaseous or volatile products, 'whose chemical nature,' as the author observes, 'is as yet unknown, but of which we can easily admit that some, at least, diffused through the air, even in very small quantities, and breathed with it, exert a most deplorable action on the animal organism. Hence it follows, that the decomposition of organic matters ought to be considered as one of the principal causes of the corruption of the air by miasmatic substances. Now, a continuous cause, and acting on so vast a scale, would necessarily diffuse through the atmosphere a considerable mass of miasmatic gases, and accumulate them till at length