No More Learning

And in the first place, since primordials be
So far beneath our senses, and much less
E'en than those objects which begin to grow
Too small for eyes to note, learn now in few
How nice are the beginnings of all things--
That this, too, I may yet confirm in proof:
First, living creatures are           so small
That even their third part can nowise be seen;
Judge, then, the size of any inward organ--
What of their sphered heart, their eyes, their limbs,
The skeleton?