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The application of the generalisations of thermotics to the problem of the duration of the earth, and of deductions from tidal phenomena to the determination of the length of the day and of the time of revolution of the moon, in past epochs of the history of the universe; and the demonstration of the competency of the great secular changes, known under the general name of the precession of the equinoxes, to cause corresponding modifications in the climate of the two hemispheres of our globe, have brought astronomy into intimate relation with geology.
The principle thus demonstrated has given a new interest and a vast impulse to the science of Thermotics. It is the fundamental and organizing conception of Professor Tyndall's work, and in his last chapter he carries out its application to the planetary system.
It would be just as reasonable to make the study of the heat of the sun a science preliminary to the rest of thermotics, as to place the study of the attraction of the bodies, which compose the universe in general, before that of the particular terrestrial bodies, which alone we can experimentally know.
Even where the knowledge of conic sections does not enter as a direct component of that analytical power which was the glory of a Lagrange, a Laplace, and a Gauss, and which is the glory of a Leverrier, a Peirce, and their companions in science, it serves as a part of the necessary scaffolding by which that skill is attained, of the necessary discipline by which their power was exercised and made available for the solution of the great problems of astronomy, optics, and thermotics, which have been solved in our century.
Electricity seems destined to annex the whole field, not merely of optics, but probably also of thermotics. Rays of light will not pass through a wall, nor, as we know only too well, through a dense fog. But electrical rays of a foot or two wave-length, of which we have spoken, will easily pierce such mediums, which for them will be transparent.
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