| Paragraph 1 | Some connexions that require proof are identical in that they possess an identical 'middle' e.g. a whole group might be proved through 'reciprocal replacement' - and of these one class are identical in genus, namely all those whose difference consists in their concerning different subjects or in their mode of manifestation. |
| Paragraph 2 | Other connexions that require proof only differ in that the 'middle' of the one is subordinate to the 'middle' of the other. |
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created 1996/11/25 modified 2009/04/26