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be just like repeatedly adding up a column of figures.
There is a possibility of blundering of course; but with any reasonable care, it is too small to be considered.

But, it may be said, "after all you must depend upon something."
No doubt; and I will tell you precisely what it is.
You have to depend upon your natural power of reasoning being better than tossng up a copper to decide which way the truth lies.
If your natural power is sever so little better than that, then a reasonable exercizes of criticism will make it as sure as you please.

This, however, supposes that your logical norms are quite right.
In the more difficult kinds of reasoning it is quite possible that there amy be an error there.
In point of fact, this does happenonly too frequently.
These norms must, themselves, be criticized.
This criticism must be conducted by reasoning.
But it may and ought to be conducted by reasoning