The genus is representation in general (representation.Under it stands representation with consciousness (perceptio).A perception which relates solely to the subject as a modification of its state, is a sensation (sensatio), an objective perception is a cognition (cognitio).A cognition is either an intuition or a conception (intuitus vel conceptus).The former has an immediate relation to the object and is singular and individual; the latter has but a mediate relation, by means of a characteristic mark which may be common to several things.A conception is either empirical or pure.
A pure conception, in so far as it has its origin in the understanding alone, and is not the conception of a pure sensuous image, is called notio.A conception formed from notions, which transcends the possibility of experience, is an idea, or a conception of reason.To one who has accustomed himself to these distinctions, it must be quite intolerable to hear the representation of the colour red called an idea.It ought not even to be called a notion or conception of understanding.
SECTION II.Of Transcendental Ideas.
Transcendental analytic showed us how the mere logical form of our cognition can contain the origin of pure conceptions a priori, conceptions which represent objects antecedently to all experience, or rather, indicate the synthetical unity which alone renders possible an empirical cognition of objects.The form of judgements- converted into a conception of the synthesis of intuitions- produced the categories which direct the employment of the understanding in experience.This consideration warrants us to expect that the form of syllogisms, when applied to synthetical unity of intuitions, following the rule of the categories, will contain the origin of particular a priori conceptions, which we may call pure conceptions of reason or transcendental ideas, and which will determine the use of the understanding in the totality of experience according to principles.