"Well," and Cobb's eyes flashed as he warmed up to his subject, "it was long ago discovered that there was a peculiar odor arising upon the passage of a current of electricity through oxygen gas; this was also perceived even in working an electrical machine. This odor was named ozone. Both of you gentlemen are sufficiently proficient in chemistry for me to pass over the various methods by which ozone can be manufactured, yet I think it quite necessary that I should state a few facts about this very remarkable gas, if, indeed, it can be called a gas; it is really allotropic oxygen. Now, oxygen can be put into a liquid state, or even into a solid state; yet it is most difficult to keep it in either of those conditions--so much so that it would be of no use for the purposes for which I desire to use it. Oxygen is contracted by passing an electric spark through it, and ozone is perceived by the peculiar odor arising therefrom. If the intensity of the current is increased sufficiently, the oxygen is proportionately decreased in bulk. Suffice it to say that oxygen can be reduced millions of times in bulk by this simple method, always provided that the electrical energy was sufficient at starting. You will perceive," and he hastily quitted the room, entered his workshop, and returned with a small bottle fitted with a tight stopper, and containing apparently a stick of camphor--"you will perceive," he continued, "when I open this bottle, a most peculiar odor, a lightness in the atmosphere, a seeming renewal of life, and a sense of languidness passing over you." Saying this, he took out the glass stopper and passed the bottle two or three times in front of Hathaway and Craft. As the bottle was moved from side to side, both of them experienced a strange sensation; it seemed that the air was heavily charged with a something that gave them feelings of unutterable lightness, of calm repose, and intense satisfaction. The lights danced about in thousands of forms, yet each appeared to possess some true and beautiful shape. They moved, they walked and ran, yet no effort seemed to be required. It was as if they were a part of some living thing, yet not a part: a part of it in that they moved and had feelings coincident with it, yet not a part because no effort was required, of brain or muscle, to be a part of it. For a moment it seemed to each of them that a state of exertionless existence had been reached, and then each knew no more. They lay in their chairs apparently lifeless. Cobb quickly replaced the stopper in the bottle, and took from his nostrils two small pieces of sponge, which had been saturated in some kind of solution. Returning to the back room, he replaced the bottle on the shelf from which he had taken it, and came back to his position by the table.