27 Aug. 1814 '.5

Logic

Ch. │ │ Invention

'.5 Helps to all

10

1

Tables useful for this purpose:-

1. Tables of contents of Books written on it.  Give Synoptic Table to Blackstone's Analysis with J.B.'s Emendations.

2. Tables of the names of subjects belonging to it.

3. Table of Rudiments of the of the inventions and notices on the subject.-

4. Table vegetable[?] Alkali from observation of properties common to Salt[?] of Parlour & d o. of Wormwood.

Fixt Alkali from d o. of Potash & Soda.

Alkali from d o of Potash Soda & Ammonia.

Memento 5 and 6. Search after analogies - Use on this occasion to be made of all existing and acceptable scales of logical subalternation.

Follows the mode and use of applying these subalternation scales, viz.

1. Application of it in the descending line.

1. With exception of such words as are names of individual objects, take any one of the material words that present themselves as belonging to the subject. Not being the name of an individual alone, this word will be the name of a sort of objects - the name (say) of an aggregate. If the aggregate denomination be the name of a genus, think of the several species which, by their respective names, present themselves as being contained under it. Whatsoever is predicated of the genus, will, in so far as it is truly predicated, be with equal truth predicable of all these several species.

II. Application of it in the ascending line.

In like manner look out for the name of the next superior genus, with reference to which the genus in question is but a species and try or[?] conjecture whether that which beyond doubt has been found predicable with truth of the whole of this species be or promise to be with like truth predicable of the whole or any other part of that genus - the aggregate designated by the name of that genus.

 For Rudiments of examples, see N o. 4 at the top of this page: and see the paper in which several of J.B.'s ideas on legislation are traced up to their source.

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