The laws and mechanics of circulation, with the principle involved in animal movement . Fig. 5.—Magnetic Lines of a Photograph by Professor Mayer. POLAR ACTION. 13 discovered, by placing a sheet of smooth paper or glass overa bar-magnet and showering fine iron filings upon it,* thatthey would arrange themselves in systematic order and inbeautiful curved lines, extending from pole to pole (Figs. 4,5, 6). Now, by applying this circumstance to the earth itselfand the actions taking place in air and water, notably thecurrents setting in and out of the poles, together with theformation o
The laws and mechanics of circulation, with the principle involved in animal movement . Fig. 5.—Magnetic Lines of a Photograph by Professor Mayer. POLAR ACTION. 13 discovered, by placing a sheet of smooth paper or glass overa bar-magnet and showering fine iron filings upon it,* thatthey would arrange themselves in systematic order and inbeautiful curved lines, extending from pole to pole (Figs. 4,5, 6). Now, by applying this circumstance to the earth itselfand the actions taking place in air and water, notably thecurrents setting in and out of the poles, together with theformation of the cloud strata, are at once made intelli-gible. If the earth itself be a prodigious magnet ( Fig. 6.—Showing the Lines of Force extending from Pole to Pole. no one should deny, since it could not otherwise be held inspace, nor motion be produced in it), and atmospheric matteris suspended in space by inter-action of the polar forces, asalleged, it follows that similar arrangements should obtainamong, the molecules as in the iron filings, the same law apply-ing for both. Furthermore, that there are such k; lines offorce stretching their long arms between the terrestrial poles, * The iron filings being very heavy, and consequently not free to move, inorder to facilitate the action the sheet is gently tapped from time to timeso as to release them for a moment, and enable them to follow their tend-encies. 14 TERRESTRIAL MAGNETISM. is fully established by the action taking place in the magneticneedle, which, the moment it is suspended and free to move,trembles, oscillates and rocks from side to side, nor pauses tillit is brought into correspondence with the magnetic meridian,one
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