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Updated: July 3, 2025
Harvey's investigations led him to doubt also the accepted theory that there was a porosity in the septum of tissue that divides the two ventricles of the heart. It seemed unreasonable to suppose that a thick fluid like the blood could find its way through pores so small that they could not be demonstrated by any means devised by man.
You saw it in Nature on Jupiter in the case of several creatures, suspecting it in the boa-constrictor and Will-o'-the-wisp and jelly-fish, and have standing illustrations of it in all tailed comets luminosity in the case of large bodies being one manifestation in the rings of this planet, and in the molecular motion and porosity of all gases, liquids, and solids on earth; since what else is it that keeps the molecules apart, heat serving merely to increase its power?
In order to make sure that this was not due to the porosity of the cloth, we constructed two small experimental surfaces of equal size, one of which was air-proofed and the other left in its natural state; but we could detect no difference in their lifting powers.
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