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accounts for their imagining that logical ideals are the same as in all men at all times.
That notion will be throughly refuted in the later lectures of this course.
If they were right, there would be no great harm in theor conclusion but they are utterly wrong; and their doctrine is quite as dangerous intellectually as any that the whole history of thought can show, because it ammounts to this, that there is no use in examining into the goodness or badness of one's logical ideals.

Let meremind you that idea of an endless chain of inquiries in the defendent argument.
This chain appears in every form of the fallacy.
It is its very clench,
It is said that we may as well accept any reasoning that seems good to us; becuase any inquiry into its value must be conducted by reasoning; and that must either be accepted on the assumption that all reasoning that seems good is good or else must be investigated by a new reasoning and on ad infinitum.
Now it is a [?]