Upon examining the edge of the sharpest razor with a microscope it will appear as broad as the back of a knife, only rough, uneven and full of notches and furrows.
But the sting of a bee on human skin seen through the same instrument exhibits everywhere the most beautiful polish, without the least flaw, blemish or inequality, and it ends in a point too fine to be discerned.
The threads of linen are coarser than yarn with which ropes are made, but a silkworm's web appears smooth and shining, and everywhere equal.
The smallest dot that is made with a pen is irregular and uneven, whereas the tiny specks on the wings or bodies of insects are found to be accurate circles.