i8 CLASSICS OF MODERN SCIENCE 

 ling instances, suggesting instances, generally useful instances, and 

 magical instances. The advantage, by which these instances excel the 

 more ordinary, regards specifically either theory or practice, or both. 

 With regard to theory, they assist either the senses or the understand- 

 ing; the senses, as in the five instances of the lamp; the understand- 

 ing, either by expediting the exclusive mode of arriving at the form, 

 as in solitary instances, or by confining, and more immediately 

 indicating the affirmative, as in the migrating, conspicuous, accompany- 

 ing, and subjunctive instances; or by elevating the understanding, 

 and leading it to general and common natures, and that either im- 

 mediately, as in the clandestine and singular instances, and those 

 of alliance ; or very nearly so, as in the constitutive ; or still less so, 

 as in the similar instances ; or by correcting the understanding of its 

 habits, as in the deviating instances ; or by leading to the grand form 

 or fabric of the universe, as in the bordering instances ; or by guard- 

 ing it from false forms and causes, as in those of the cross and of 

 divorce. With regard to practice, they either point it out, or measure, 

 or elevate it. They point it out, either by showing where we must 

 commence in order not to repeat the labors of others, as in the in- 

 stances of power; or by inducing us to aspire to that which may be 

 possible, as in the suggesting instances; the four mathematical in- 

 stances measure it. The generally useful and the magical elevate it. 

 Again, out of these twenty-seven instances, some must be collected 

 immediately, without waiting for a particular investigation of 

 properties. Such are the similar, singular, deviating, and bordering 

 instances, those of power, and of the gate, and suggesting, generally 

 useful, and magical instances; for these either assist and cure the 

 understanding and senses, or furnish our general practice. The 

 remainder are to be collected when we furnish our synoptical tables for 

 the work of the interpreter, upon any particular nature; for these 

 instances, honored and gifted with such prerogatives, are like the 

 soul amid the vulgar crowd of instances, and (as we from the first 

 observed) a few of them are worth a multitude of the others. When, 

 therefore, we are forming our tables they must be searched out with 

 the greatest zeal, and placed in the table. And, since mention must 

 be made of them in what follows, a treatise upon their nature has 

 necessarily been prefixed. We must next, however, proceed to the 

 supports and corrections of induction, and thence to concretes, the 



