3727. Their fallacy in supposing otherwise is again refuted by [the case of] the antipodes, inasmuch as if they did not know that there were antipodes, and that we come into that relation every twelfth hour, no one would ever believe it, because he would suppose that they would thus fall off. The cause was then stated, to wit, that there is a [principle of] gravitation in each minutest particle of a man, which presses [him] towards the earth, and since there is such a sphere of gravitation in each single particle, therefore it is up or down to a man according to gravitation; which is also confirmed by other well known experiences in respect to the centripetal force. In these things, when heard, the spirits acquiesced. - 1748, October 28. It was said that the fluids in the human body had their up and down not according to the sphere without the body; for they are then confirmed in their upward and downward motion, and in their tendency to [particular] quarter, according to endeavor [nisus], concerning which much might be said. Thus the blood and other fluids do not recognize the same up and down in the body, which [holds] without, which is also confirmed by experience.