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possible a priori； the empirical only a posteriori。
We apply the term sensibility to the receptivity of the mind for
impressions； in so far as it is in some way affected； and； on the
other hand； we call the faculty of spontaneously producing
representations； or the spontaneity of cognition； understanding。 Our
nature is so constituted that intuition with us never can be other
than sensuous； that is； it contains only the mode in which we are
affected by objects。 On the other hand； the faculty of thinking the
object of sensuous intuition is the understanding。 Neither of these
faculties has a preference over the other。 Without the sensuous
faculty no object would be given to us； and without the
understanding no object would be thought。 Thoughts without content are
void； intuitions without conceptions； blind。 Hence it is as
necessary for the mind to make its conceptions sensuous （that is； to
join to them the object in intuition）； as to make its intuitions
intelligible （that is； to bring them under conceptions）。 Neither of
these faculties can exchange its proper function。 Understanding cannot
intuite； and the sensuous faculty cannot think。 in no other way than
from the united operation of both； can knowledge arise。 But no one
ought； on this account； to overlook the difference of the elements
contributed by each； we have rather great reason carefully to separate
and distinguish them。 We therefore distinguish the science of the laws
of sensibility； that is； aesthetic； from the science of the laws of
the understanding； that is； logic。
Now； logic in its turn may be considered as twofold… namely； as
logic of the general； or of the particular use of the understanding。
The first contains the absolutely necessary laws of thought； without
which no use whatsoever of the understanding is possible； and gives
laws therefore to the understanding； without regard to the
difference of objects on which it may be employed。 The logic of the
particular use of the understanding contains the laws of correct
thinking upon a particular class of objects。 The former may be
called elemental logic… the latter； the organon of this or that
particular science。 The latter is for the most part employed in the
schools； as a propaedeutic to the sciences； although； indeed；
according to the course of human reason； it is the last thing we
arrive at； when the science has been already matured； and needs only
the finishing touches towards its correction and completion； for our
knowledge of the objects of our attempted science must be tolerably
extensive and complete before we can indicate the laws by which a
science of these objects can be established。
General logic is again either pure or applied。 In the former； we
abstract all the empirical conditions under which the understanding is
exercised； for example； the influence of the senses； the play of the
fantasy or imagination； the laws of the memory； the force of habit； of
inclination； etc。； consequently also； the sources of prejudice… in a
word； we abstract all causes from which particular cognitions arise；
because these causes regard the understanding under certain
circumstances of its application； and； to the knowledge of them
experience is required。 Pure general logic has to do； therefore；
merely with pure a priori principles； and is a canon of
understanding and reason； but only in respect of the formal part of
their use； be the content what it may； empirical or transcendental。
General logic is called applied； when it is directed to the laws of
the use of the understanding； under the subjective empirical
conditions which psychology teaches us。 It has therefore empirical
principles； although； at the same time； it is in so far general；
that it applies to the exercise of the understanding； without regard
to the difference of objects。 On this account； moreover； it is neither
a canon of the understanding in general； nor an organon of a
particular science； but merely a cathartic of the human understanding。
In general logic； therefore； that part which constitutes pure
logic must be carefully distinguished from that which constitutes
applied （though still general） logic。 The former alone is properly
science； although short and dry； as the methodical exposition of an
elemental doctrine of the understanding ought to be。 In this；
therefore； logicians must always bear in mind two rules：
1。 As general logic； it makes abstraction of all content of the
cognition of the understanding； and of the difference of objects；
and has to do with nothing but the mere form of thought。
2。 As pure logic； it has no empirical principles； and consequently
draws nothing （contrary to the common persuasion） from psychology；
which therefore has no influence on the canon of the understanding。 It
is a demonstrated doctrine； and everything in it must be certain
completely a priori。
What I called applied logic （contrary to the common acceptation of
this term； according to which it should contain certain exercises
for the scholar； for which pure logic gives the rules）； is a
representation of the understanding； and of the rules of its necessary
employment in concreto； that is to say； under the accidental
conditions of the subject； which may either hinder or promote this
employment； and which are all given only empirically。 Thus applied
logic treats of attention； its impediments and consequences； of the
origin of error； of the state of doubt； hesitation； conviction；
etc。； and to it is related pure general logic in the same way that
pure morality； which contains only the necessary moral laws of a
free will； is related to practical ethics； which considers these
laws under all the impediments of feelings； inclinations； and passions
to which men are more or less subjected； and which never can furnish
us with a true and demonstrated science； because it； as well as
applied logic； requires empirical and psychological principles。
II。 Of Transcendental Logic。
General logic； as we have seen； makes abstraction of all content
of cognition； that is； of all relation of cognition to its object； and
regards only the logical form in the relation of cognitions to each
other； that is； the form of thought in general。 But as we have both
pure and empirical intuitions （as transcendental aesthetic proves）； in
like manner a distinction might be drawn between pure and empirical
thought （of objects）。 In this case； there would exist a kind of logic；
in which we should not make abstraction of all content of cognition；
for or logic which should comprise merely the laws of pure thought （of
an object）； would of course exclude all those cognitions which were of
empirical content。 This kind of logic would also examine the origin of
our cognitions of objects； so far as that origin cannot be ascribed to
the objects themselves； while； on the contrary； general logic has
nothing to do with the origin of our cognitions； but contemplates
our representat