Toearth，then，letusassignthecubicalform；forearthisthe
mostimmoveableofthefourandthemostplasticofallbodies，and
thatwhichhasthemoststablebasesmustofnecessitybeofsucha
nature。Now，ofthetriangleswhichweassumedatfirst，thatwhich
hastwoequalsidesisbynaturemorefirmlybasedthanthatwhichhas