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The Outline of Science - Volume 1

J. Arthur Thomson

Book Overview: 

The Outline of Science, Volume 1 was written specifically with the man-on-the-street in mind as the target audience. Covering scientific subjects ranging from astronomy to biology to elementary physics in clear, concise and easily understood prose, this popular science work is largely as relevant today as when first published. Special emphasis is given to the principles of biological adaptation and evolution, especially how they relate to the rise of the human species from lower orders. Also included are the basics of the (then) fairly new concept of relativity and its impact on emerging scientific theories.

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Book Excerpt: 
. . .Photo: Professor E. E. Barnard, Yerkes Observatory.

FIG. 13.—SATURN, November 19, 1911

Showing the rings, mighty swarms of meteorites.

Every chemical element known, then, has a distinctive spectrum of its own when it is raised to incandescence, and this distinctive spectrum is as reliable a means of identification for the element as a human face is for its owner. Whether it is a substance glowing in the laboratory or in a remote star makes no difference to the spectroscope; if the light of any substance reaches it, that substance will be recognised and identified by the characteristic set of waves.

The spectrum of a glowing mass of gas will consist in a number of bright lines of various colours, and at various intervals; corresponding to each kind of gas, there will be a peculiar and distinctive arrangement of bright lines. But if the light from such a mass of glowing gas be made to pass through a cool mas. . . Read More