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Updated: July 3, 2025
Experience shows that matter possesses infinite divisibility, infinite expansibility, porosity without assignable limits, and permeability by heat, electricity, and magnetism, together with a power of retaining them indefinitely; affinities, reciprocal influences, and transformations without number: qualities, all of them, hardly compatible with the assumption of an impenetrable aliquid.
That there is Empty Space or Void he proves by all the varied motions on land and sea which we behold; by the porosity even of hardest things, as we see in dripping caves. There is the food also which disperses itself throughout the body, in trees and cattle. Voices pass through closed doors, frost can pierce even to the bones.
It is there that examining the vast porosity of bodies, every particle having its pores, and every particle of those particles having its own, he shows we are not certain that there is a cubic inch of solid matter in the universe, so far are we from conceiving what matter is.
As the tube is entirely of porcelain, it may likewise be plunged into boiling water so as to destroy the germs that may have entered the sides or, better yet, it may be heated over a gas burner or in an ordinary oven. In this way all the organic matter will be burned, and the tube will resume its former porosity. M. Chamberland, La Nature.
The porosity of rock is not always a criterion of its permeability; a very fine grained marble, containing about 0.6 per cent. cell space, transmitted water and oil more freely than a shale that would hold 4 per cent. of its bulk of water. If the above conclusions hold on a large scale as on the small, they may aid in explaining the diminished flow of oil wells.
It prevents, better than any other material, the loss of heat from the body, and allows free ventilation and evaporation. Its fibers are so lightly woven that they make innumerable meshes enclosing air, which is one of the best of non-conductors. Silk ranks next to wool in warmth and porosity. It is much softer and less irritating than flannel or merino, and is very useful for summer wear.
Do the great cavities, which are exclusively called caverns, owe their origin to the same causes as those which have produced the lodes of veins and of metalliferous strata, or the extraordinary phenomenon of the porosity of rocks? Do grottoes belong to every formation, or to that period only when organized beings began to people the surface of the globe?
These will naturally precipitate upon the table or upon the slanting sides of the core, and the mould will therefore present great inequalities as regards porosity.
The subdivision of the land into so many islands and keys, the absence of mountains, the showery characteristic of the rainfall, the porosity of the rock, and the great heat reflected from the white coral, are the chief causes for the want of running water.
One explanation that suggests itself is, that as there is considerable variation in evaporation of individual eggs due to the amount of shell porosity, and the chicks that hatch in either case may be the ones whose individual variations threw them nearer the normal.
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