On the nature of things (books 4 - 6)   

ORIGINS OF VEGETABLE AND
ANIMAL LIFE

And now to what remains!- Since I've resolved
By what arrangements all things come to pass
Through the blue regions of the mighty world,-
How we can know what energy and cause
Started the various courses of the sun
And the moon's goings, and by what far means
They can succumb, the while with thwarted light,
And veil with shade the unsuspecting lands,
When, as it were, they blink, and then again
With open eye survey all regions wide,
Resplendent with white radiance- I do now
Return unto the world's primeval age
And tell what first the soft young fields of earth
With earliest parturition had decreed
To raise in air unto the shores of light
And to entrust unto the wayward winds.

In the beginning, earth gave forth, around
The hills and over all the length of plains,
The race of grasses and the shining green;
The flowery meadows sparkled all aglow
With greening colour, and thereafter, lo,
Unto the divers kinds of trees was given
An emulous impulse mightily to shoot,
With a free rein, aloft into the air.
As feathers and hairs and bristles are begot
The first on members of the four-foot breeds
And on the bodies of the strong-y-winged,
Thus then the new Earth first of all put forth
Grasses and shrubs, and afterward begat
The mortal generations, there upsprung-
Innumerable in modes innumerable-
After diverging fashions. For from sky
These breathing-creatures never can have dropped,
Nor the land-dwellers ever have come up
Out of sea-pools of salt. How true remains,
How merited is that adopted name
Of earth- "The Mother!"- since from out the earth
Are all begotten. And even now arise
From out the loams how many living things-
Concreted by the rains and heat of the sun.
Wherefore 'tis less a marvel, if they sprang
In Long Ago more many, and more big,
Matured of those days in the fresh young years
Of earth and ether. First of all, the race
Of the winged ones and parti-coloured birds,
Hatched out in spring-time, left their eggs behind;
As now-a-days in summer tree-crickets
Do leave their shiny husks of own accord,
Seeking their food and living. Then it was
This earth of thine first gave unto the day
The mortal generations; for prevailed
Among the fields abounding hot and wet.
And hence, where any fitting spot was given,
There 'gan to grow womb-cavities, by roots
Affixed to earth. And when in ripened time
The age of the young within (that sought the air
And fled earth's damps) had burst these wombs, O then
Would Nature thither turn the pores of earth
And make her spurt from open veins a juice
Like unto milk; even as a woman now