By reason thus, the thicknesse of halfe the earth is (as shall be shewed) about 4000 miles, now the plumb height of the highest mountaines is not accounted aboue a mile and a halfe, or two miles at the most. Now betweene two miles and foure thousand, there is no sensible proportion, and a line that is foure thousand and two miles long, will not seeme sensibly longer then that which is foure thousand; as for example. Let (_O_) be the center of the earth, (_XW_) a part of the circle of the earth which runneth by the bottomes of the hils and superficies of champion and even plaines (_WO_) or (_XO_) is the semidiamiter or halfe the depth of the earth. (_S_) is a hill rising vp aboue that plaine of the earth, (_WS_) is the plumb height of the hill. I say that (_WS_) doth not sensibly alter the length of the line (_OW_); for (_WS_) is but two miles. (_WO_) 4000 miles, and two to 4000 alters not much more, then the breadth of a pinne to the length of a pearch. So a line drawne from (_O_) the center to (_S_) the top of the hill, is in a manner all one with a line drawen to (_W_) the bottome of the hill. [Illustration] The third rule. 3 _The earth resteth immovable in the very midst of the whole earth._ Two points are here to be demonstrated. _First that the earth standeth exactly in the midst of the World. Secondly that it is immoveable._ The former is proved by these reasons. 1 The naturall heavinesse of the earth and water is such, as they will never cease mooving downewards till they come to the lowest place; Now the center or middle point of the world is the lowest place, and _ergo_ they must needs moue thither, as for example. Let (_O_) be the center of the world, (_CDE_) the heauens: it is manifest that the lowest place from the heauens on all sides is (_O_). Ssuppose the earth to be in (_A_) or in (_B_) some where out of the center, I say it is not possible (vnlesse it be violently held vp) that it should abide there, but it will descend till it come to (_O_) the middle point. [Illustration]