senses--so mayst see
They differ too in elemental shapes.
Thus unlike forms into one mass combine,
And things exist by intermixed seed.

But still 'tmust not be thought that in all ways
All things can be conjoined; for then wouldst view
Portents begot about thee every side:
Hulks of mankind half brute astarting up,
At times big branches sprouting from man's trunk,
Limbs of a sea-beast to a land-beast knit,
And nature along the all-producing earth
Feeding those dire Chimaeras breathing flame
From hideous jaws--Of which 'tis simple fact
That none have been begot; because we see
All are from fixed seed and fixed dam
Engendered and so function as to keep
Throughout their growth their own ancestral type.
This happens surely by a fixed law:
For from all food-stuff, when once eaten down,
Go sundered atoms, suited to each creature,
Throughout their bodies, and, conjoining there,
Produce the proper motions; but we see
How, contrariwise, nature upon the ground
Throws off those foreign to their frame; and many
With viewless bodies from their bodies fly,
By blows impelled--those impotent to join
To any part, or, when inside, to accord
And to take on the vital motions there.
But think not, haply, living forms alone
Are bound by these laws: they distinguished all.

*****

For just as all things of creation are,
In their whole nature, each to each unlike,
So must their atoms be in shape unlike--
Not since few only are fashioned of like form,
But since they all, as general rule, are not
The same as all. Nay, here in these our verses,
Elements many, common to many words,
Thou seest, though yet 'tis needful to confess
The words and verses differ, each from each,
Compounded out of different elements--
Not since few only, as common letters, run
Through all the words, or no two words are made,
One and the other, from all like elements,
But since they all, as general rule, are not
The same as all. Thus, too, in other things,
Whilst many germs common to many things
There are, yet they, combined among themselves,
Can form new wholes to others quite unlike.
Thus fairly one may say that humankind,
The grains, the gladsome trees, are all made up
Of different atoms. Further, sinc