As he studied the deflections produced for all four possible positions of such a wire, with both cell polarities, he came to realize that if a rectangular wire loop in a vertical plane enclosed a compass needle, all parts of the horizontal sides of the loop would produce additive deflections.
"The Earliest Electromagnetic Instruments"
Robert A. Chipman
If the physiological units in the germ-cell mould the aggregate organism, the organism modified by incident actions will impress some corresponding modifications on the structures and polarities of its units.
"Herbert Spencer"
J. Arthur Thomson
In relation to ourselves we are concerned with two great polarities, the polarity of Soul and Body and the polarity of Soul and Spirit; and it is in order that he may more clearly realize their working that I want the student to have some preliminary idea of Polarity as a general principle.
"The Creative Process in the Individual"
Thomas Troward