practised by him who desires common sense to reign supreme in all his
actions and decisions, is incontestably deduction.

"When the union of ideas, which judgment permits, is made with perception
and exactness, there results always an analysis, which, if practised
frequently, will end by becoming almost a mechanical act.

"It is, however, well to study the phases of this analysis, in order to
organize them methodically first.

"Later, when the mind shall be sufficiently drilled in this kind of
gymnastics, all their movements will be repeated in an almost unconscious
way, and deduction, that essential principle of common sense, will be
self-imposed.

"In order that deductions may be a natural development, the element
relating to those which should be the object of judgment should be
grouped first.

"The association of statements is an excellent method for it introduces
into thought the existence of productive agents.

"We have already spoken of the grouping of thoughts, which is a more
synthetical form of that selection.

"Instead of allowing it to be enlarged by touching lightly on all that
which is connected with the subject, it is a question, on the contrary,
of confining it to the facts relating to only one object.

"These facts should be drawn from the domain of the past; by comparison,