all which, add the _variation_ made by the Different _lights_ and _shadows_, and you may have sufficient reason to ghess that a _point_ may appear much more _ugly_ then _this_, which I have here presented, which though it appear’d through the _Microscope_ _gray_, like a great splatch of _London_ dirt, about three inches over; yet to the _naked eye_ it was _black_ and no bigger then that in the midst of the Circle A. And could I have found Room in this Plate to have inserted an O you should have seen that the _letters_ were not more distinct then the _points_ of Distinction, nor a _drawn circle_ more exactly _so_, then we have now shown a _point_ to be a _point_. * * * * * Observ. II. _Of the Edge of a Razor._ The sharpest _Edge_ hath the same kind of affinity to the sharpest _Point_ in Physicks, as a _line_ hath to a _point_ in Mathematicks; and therefore the Treaty concerning this, may very properly be annexed to the former. A Razor doth appear to be a Body of a very neat and curious aspect, till more closely viewed by the _Microscope_, and there we may observe its very Edge to be of all kind of shapes, except what it should be. For examining that of a very sharp one, I could not find that any part of it had any thing of sharpness in it; but it appeared a rough surface of a very considerable bredth from side to side, the narrowest part not seeming thinner then the back of a pretty thick Knife. Nor is’t likely that it should appear any otherwise, since as we just now shew’d that a _point_ appear’d a _circle_, ’tis rational a _line_ should be a _parallelogram_.