That a few men pass from one class to another is no disproof of this.

Yet he wrought these theories one after another to their own disproof.

No documentary proof can be given of its veracity; and there is no disproof.

Is this one of the reasons why the believer is able to continue a believer in spite of all disproof?

What did occur to me was an argument, at least to my mind, in disproof of the efficacy of this precaution.

But there are assertions which are subjects for proof or disproof, viz.

As we have already said, the hypothesis is one which does not admit either of proof or disproof.

That he is frequently shot is no disproof of this assertion.

The Friar lifted up his foot in disproof, but the shoe was there.

Given a verifiable hypothesis, however, what constitutes proof or disproof?