he
expressed it, a world of guesswork or opinion ((Greek) _doxa_). As to
the origin of things within this sphere he was ready enough to borrow
[90] from the speculations of his predecessors. Earth and water are
the sources from which we spring; and he imagined a time when there was
neither sea nor land, but an all-pervading slough and slime; nay, many
such periods of inundation and emergence had been, hence the sea-shells
on the tops of mountains and the fossils in the rocks. Air and fire
also as agencies of change are sometimes referred to by him;
anticipations in fact are visible of the fourfold classification of the
elements which was formally made by some of his successors.

[91]

II. PARMENIDES.--The pupil and successor of Xenophanes was PARMENIDES,
a native of Elea. In a celebrated dialogue of Plato bearing the name
of {34} this philosopher he is described as visiting Socrates when the
latter was very young. "He was then already advanced in years, very
hoary, yet noble to look upon, in years some sixty and five." Socrates
was born about 479 B.C. The birth of Parmenides might therefore, if
this indication be authentic, be about 520. He was of a wealthy and
noble family, and able therefore to devote himself to a learned
leisure. Like his master he expounded his views in verse, and
fragments of his poem of considerable length and importance have been
preserved. The title of the work was _Peri Phueos_--_Of Nature_.

[93]

The exordium of the poem is one of some grandeur. The poet describes
himself as soaring aloft to the sanctuary of wisdom where it is set in
highest aether, the daughters of the Sun being his guides; under whose
leading having traversed the path of perpetual day and at length
attained the temple of the goddess, he from her lips received
instruction in the eternal verities, and had shown to him the deceptive
guesses of mortals. "'Tis for thee," she says, "to hear of both,--to
have disclosed to thee on the one hand the sure heart of convincing
verity, on the other hand the guesses of mortals wherein is no
ascertainment. Nevertheless thou shalt learn of these also, that
having gone through them all thou may'st see by what unsureness of path
must he go who goeth the way of opinion. From such a way of searching
{35} restrain thou thy thought, and let not the much-experimenting
habit force thee along the path wherein thou must use thine eye, yet
being sightless, and the ear with its clam