| http://www.w3.org/ns/prov#value | - By describing the doctrine as quasi-necessary, or formal, I mean that we observe the characters of such signs as we know, and from such an observation, by a process which I will not object to naming Abstraction, we are led to statements, eminently fallible, and therefore in one sense by no means necessary, as to what must be the characters of all signs used by a "scientific intelligence, that i
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