Abstract
THIS volume, which is No. 175 in the excellent “Sammlung Göschen,” well maintains the high standard of the series. It is difficult, indeed, to see in what way these tiny volumes could be improved. Most careful pruning must have been exercised by each author, and the result is a concise, compact summary of present-day knowledge. The subjects of the chapters are the magnetic elements, the permanent magnetism of the earth, the variations of the earth's magnetism, earth currents, and the aurora. The variations are illustrated by diagrams, and include secular, daily and annual variations and their theory, magnetic storms, the eleven-year period, and influence of the sun, moon and planets.
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