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The particles of air are kept at a distance from each other by their mutual repulsion. Every three particles mutually and equally repelling each other, must form an equilateral triangle. All the particles of air gravitate towards the earth, which gravitation compresses them, and shortens the sides of the triangles, otherwise their mutual repellency would force them to greater distances from each other.

XXIV. Physical and meteorological observations, conjectures, and suppositions