Heronis Alexandrini spiritalium liber

Let us understand above the moist surface, compressed according to which the water is placed, that there is some body equally heavy as the moist, and having the same shape as the moist above; let us understand this to be cast into the moist, so that its lower surface coincides with the compressed and is as that very thing; and likewise let it be placed as the moist above. It is therefore clear that this body, when lowered, neither stands out from the moist, nor is submerged below the surface of the moist above. Since it has been demonstrated by Archimedes in his book original: "De ijs, quę in aqua uehuntur" On Floating Bodies that bodies equally heavy as the moist, when lowered into the moist, neither stand out from the moist nor are submerged. Therefore, it will not compress those things which are placed beneath. But with the compressing things removed from above, the body will remain in the same place. How, therefore, will it compress a body which does not seek to descend into a lower place? In the same way, the moist, where the body was, will not compress the things placed beneath; for as far as rest and motion are concerned, the said