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extremest difficulty to conpress into eight lectures enought to make them genuinely helpful, owing to the nature of the subject which renders it necessary to make a pretty thorough study of kind of reasoning which you will have little occasion to emply before you can understand the reasons for the rules that apply to the kinds of reasoning that you will have to employ.

You ought not to be satisfied to take my word for it that a given form of reasoning is sound.
You ought not and I am sure you will not.
You will require that it made evident to your own reason.
Now I will not go into the busines of deceiving you.
I will not pass off upon you as a satisfactory proof one which you out not to regard as satisfactory.
I will not, therefore, support any form of reasoning merely by a few promiscuous examples.
For most fallacies are due to