10. Why it has been thought to be so limited.
The reason why it has been generally sought for, and supposed to be
only in those, I imagine has been, not only the general usefulness of those sciences: but because, in comparing
their equality or excess, the modes of numbers have every the least difference very clear and perceivable: and
though in extension every the least excess is not so perceptible, yet the mind has found out ways to examine, and
discover demonstratively, the just equality of two angles, or extensions, or figures: and both these, i.e., numbers
and figures, can be set down by visible and lasting marks, wherein the ideas under consideration are perfectly
determined; which for the most part they are not, where they are marked only by names and words.
