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The Last of the Gases.—The last of the gases that had never been condensed to liquids—oxygen, hydrogen, and nitrogen—have at length yielded to pertinacious experiment, and, under the joint influence of greater degrees of cold and pressure than had ever before been employed, have been reduced to the liquid form. This great experimental exploit has been performed by two chemists independently, and almost simultaneously—Raoul Pictet, of Geneva, and M. L. Cailletet, of Paris, by different processes. Pictet condensed oxygen, which was first announced; but Cailletet had already done it, and he also liquefied nitrogen, hydrogen, and the air. We give a representation of his apparatus, and an account of his processes, and shall give fuller statements of the results as they are more fully announced.