Ladies and Gentlemen:

I explained at the end of the last lecture
how to ascertain speedily and certainly whether a
graph is absurd or not after the junctures are
got rid of. I now give the rule for getting rid
of the junctures. Let me repeat that I think there
are probably better rules than that which I give; but it
is the duty of my students to find these out.
My rule, until I learn of a better one is as follows:
[??} of a reasoning

Perhaps I shall do well to explain set forth to you the
line of my thought by which my rule,
such as it is, has been derived; because it
is comparatively simple, and will give you some rough idea of the kind of reasoning
required in establishing a system of logic.

I begin by asking myself, How is it
that I need any such rule? The first answer

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