lower than twenty.

_Her_. Put it at that.

_Ly_. Plato will come next with as many more, and then Aristotle cannot do
with less.

_Her_. No.

_Ly_. As to Chrysippus, I need not ask you; you have told me already that
forty is barely enough.

_Her_. That is so.

_Ly_. And we have still Epicurus and the others. I am not taking high
figures, either, as you will see if you reflect upon the number of
octogenarian Stoics, Epicureans, and Platonists who confess that they
have not yet completely mastered their own systems. Or, if they did not
confess it, at any rate Chrysippus, Aristotle, and Plato would for them;
still more Socrates, who is as good as they; he used to proclaim to all
comers that, so far from knowing all, he knew nothing whatever, except
the one fact of his own ignorance. Well, let us add up. Twenty years we
gave Pythagoras, the same to Plato, and so to the others. What will the
total come to, if we assume only ten schools?

_Her_. Over two hundred years.

_Ly_. Shall we deduct a quarter of that, and say a hundred and fifty
will do? or can we halve it?