fall very slowly in the air.Theoretically, a small spherical body should fall at the same rate as a large spherical body of the same composition; but it does not, and this may easily be demonstrated by throwing a shovelful of coal composed of pellets of various sizessome as fine as dust-into the air at a height of even six or eight feet.The very finest dust floats for some time in the air, and the largest ~~e l l c t s I t is indeed reach the ground first.due to this surface attraction that small bodies like pollen grains, fungus spores and the lilre, are capable of being transported through the air over such great distances.
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W. K. Gregory (1905) studied this question.
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