to return again to the top, and stay there, thrust into the water a Glass reversed with the mouth downwards, the which shall carry with it the Air it contains, and move this towards the Ball, abasing it till such time that you see, by the transparency of the Glass, that the contained Air do arrive to the summity of the _B_all[53]: then gently withdraw the Glass upwards, and you shall see the _B_all to rise, and afterwards stay on the top of the water[54], if you carefully part the Glass and the water without overmuch commoving and disturbing it. There is, therefore, a certain affinity between the Air and other Bodies, which holds them unied, so, that they seperate not without a kind of violence. The same likewise is seen in the water[55]; for if we shall wholly submerge some Body in it, so that it be thorowly bathed, in the drawing of it afterwards gently out again, we shall see the water follow it, and rise notably above its Surface, before it seperates from it. Solid Bodies, also[56], if they be equall and alike in Superficies, so, that they make an exact Contact without the interposition of the least Air, that may part them in the seperation and yield untill that the ambient _Medium_ succeeds to replenish the place, do hold very firmly conjoyned, and are not to be seperated without great force but, because, the Air, Water, and other Liquids, very expeditiously shape themselves to contact with any Solid _B_odies, so that their Superficies do exquisitely adopt themselves to that of the Solids, without any thing remaining between them, therefore, the effect of this Conjunction and Adherence is more manifestly and frequently observed in them, than in hard and inflexible Bodies, whose Superficies do very rarely conjoyn with exactness of Contact[57]. This is therefore that Magnetick vertue, which with firm Connection conjoyneth all Bodies, that do touch without the interposition of flexible fluids; and, who knows, but that that a Contact, when it is very exact, may be a sufficient Cause of the Union and Continuity of the parts of a naturall _B_ody? [51] _A_ Magnetisme in the _A_ir, by which it bears up those Solids in the water, that are contiguous with it. [52] The Effect of the Airs Contiguity in the Natation of Solids. [53] The force of Contact. [54] _A_n Affectation of Conjunction betwixt Solids and the Air contiguous to them. [55] The like affectation of Conjunction betwixt Solids & the water. [56] Also the like affectation and Conjunction betwixt Solids themselves. [57] Contact may be the Cause of the Continuity of Naturall Bodies.