. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. EECENT PROGRESS IN PHYSICS. 391 Fig. 84. is filled with air containing ozone, and closed witli a cork, (Fig. 84.) having two holes bored in it. Through one of the holes a tube passes nearly to the I bottom, having a funnel at its upper end ; through the other hole a tube passes, which , merely goes through the cork, and above ; the cork is bent horizontally, ending in a . tolerably fine opening ; water being poured , through the funnel in a
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. EECENT PROGRESS IN PHYSICS. 391 Fig. 84. is filled with air containing ozone, and closed witli a cork, (Fig. 84.) having two holes bored in it. Through one of the holes a tube passes nearly to the I bottom, having a funnel at its upper end ; through the other hole a tube passes, which , merely goes through the cork, and above ; the cork is bent horizontally, ending in a . tolerably fine opening ; water being poured , through the funnel in a regulated stream, the air containing the ozone is driven out through the point of the other tube. This point now behaves exactly like a metallic point from which an electrical brush issues. By holding the nose to it the electrical odor will be observed ; the iodide paper held before it turns hlue^ and a platinum plate exposed to the jet is polarized electro-nega- iivehj. We have seen above that all the effects of ozone disappear when the point emitting the brush is heated, in like manner all the re- actions of ozone disappear as soon as the horizontal part of the escape tube is strongly heated by a s{)irit lamp. The air which escapes from the opening of the hot tube has no longer any smell, it will not turn the iodide paper blue, nor polarize the platinum plate. But all these effects reappear on the cooling of the tube. § 98. Chemical naiure of ozone.—Schonbein, the discoverer of ozone, has observed and investigated for years, with unwearied industry, the relations of this remarkable substance, and has found that it bears the greatest resemblance to the hyper oxides ; he has finally come to the opinion that ozone is nothing else than a gaseous peroxide of hydrogen.*^ Ozone is therefore formed by a further oxidation of the vapor of Avater contained in the air. Thus it is explained why water, or rather the vapor of water, is absolutely necessary to the formation of ozone. In
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