But mine differs from it in three points especially; viz.

in the end aimed at; in the order of demonstration; and in the starting point of the inquiry.
For the end which this science of mine proposes is the invention not of arguments but of arts; not of things in accordance with principles, but of principles themselves; not of probable reasons, but of designations and directions for works.

And as the intention is different, so accordingly is the effect; the effect of the one being to overcome an opponent in argument, of the other to command nature in action.
In accordance with this end is also the nature and order of the demonstrations.

For in the ordinary logic almost all the work is spent about the syllogism.

Of induction the logicians seem hardly to have taken any serious thought, but they pass it by with a slight notice, and hasten on to the formulae of disputation.