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experience； and thus endeavours to raise it above the empirical；
though it must still be in connection with it。 This happens from the
fact that； for a given conditioned； reason demands absolute totality
on the side of the conditions （to which the understanding submits
all phenomena）； and thus makes of the category a transcendental
idea。 This it does that it may be able to give absolute pleteness
to the empirical synthesis； by continuing it to the unconditioned
（which is not to be found in experience； but only in the idea）。 Reason
requires this according to the principle： If the conditioned is
given the whole of the conditions； and consequently the absolutely
unconditioned； is also given； whereby alone the former was possible。
First； then； the transcendental ideas are properly nothing but
categories elevated to the unconditioned； and they may be arranged
in a table according to the titles of the latter。 But； secondly； all
the categories are not available for this purpose； but only those in
which the synthesis constitutes a series… of conditions subordinated
to； not co…ordinated with； each other。 Absolute totality is required
of reason only in so far as concerns the ascending series of the
conditions of a conditioned； not； consequently； when the question
relates to the descending series of consequences； or to the
aggregate of the co…ordinated conditions of these consequences。 For；
in relation to a given conditioned； conditions are presupposed and
considered to be given along with it。 On the other hand； as the
consequences do not render possible their conditions； but rather
presuppose them… in the consideration of the procession of
consequences （or in the descent from the given condition to the
conditioned）； we may be quite unconcerned whether the series ceases or
not； and their totality is not a necessary demand of reason。
Thus we cogitate… and necessarily… a given time pletely elapsed
up to a given moment； although that time is not determinable by us。
But as regards time future； which is not the condition of arriving
at the present； in order to conceive it； it is quite indifferent
whether we consider future time as ceasing at some point； or as
prolonging itself to infinity。 Take； for example； the series m； n；
o； in which n is given as conditioned in relation to m； but at the
same time as the condition of o； and let the series proceed upwards
from the conditioned n to m （l； k； i； etc。）； and also downwards from
the condition n to the conditioned o （p； q； r； etc。）… I must
presuppose the former series； to be able to consider n as given； and n
is according to reason （the totality of conditions） possible only by
means of that series。 But its possibility does not rest on the
following series o； p； q； r； which for this reason cannot be
regarded as given； but only as capable of being given （dabilis）。
I shall term the synthesis of the series on the side of the
conditions… from that nearest to the given phenomenon up to the more
remote… regressive； that which proceeds on the side of the
conditioned； from the immediate consequence to the more remote； I
shall call the progressive synthesis。 The former proceeds in
antecedentia； the latter in consequentia。 The cosmological ideas are
therefore occupied with the totality of the regressive synthesis；
and proceed in antecedentia； not in consequentia。 When the latter
takes place； it is an arbitrary and not a necessary problem of pure
reason； for we require； for the plete understanding of what is
given in a phenomenon； not the consequences which succeed； but the
grounds or principles which precede。
In order to construct the table of ideas in correspondence with
the table of categories； we take first the two primitive quanta of all
our intuitions； time and space。 Time is in itself a series （and the
formal condition of all series）； and hence； in relation to a given
present； we must distinguish a priori in it the antecedentia as
conditions （time past） from the consequentia （time future）。
Consequently； the transcendental idea of the absolute totality of
the series of the conditions of a given conditioned； relates merely to
all past time。 According to the idea of reason； the whole past time；
as the condition of the given moment； is necessarily cogitated as
given。 But； as regards space； there exists in it no distinction
between progressus and regressus； for it is an aggregate and not a
series… its parts existing together at the same time。 I can consider a
given point of time in relation to past time only as conditioned；
because this given moment es into existence only through the past
time rather through the passing of the preceding time。 But as the
parts of space are not subordinated； but co…ordinated to each other；
one part cannot be the condition of the possibility of the other；
and space is not in itself； like time； a series。 But the synthesis
of the manifold parts of space… （the syntheses whereby we apprehend
space）… is nevertheless successive； it takes place； therefore； in
time； and contains a series。 And as in this series of aggregated
spaces （for example； the feet in a rood）； beginning with a given
portion of space； those which continue to be annexed form the
condition of the limits of the former… the measurement of a space must
also be regarded as a synthesis of the series of the conditions of a
given conditioned。 It differs； however； in this respect from that of
time； that the side of the conditioned is not in itself
distinguishable from the side of the condition； and； consequently；
regressus and progressus in space seem to be identical。 But；
inasmuch as one part of space is not given； but only limited； by and
through another； we must also consider every limited space as
conditioned； in so far as it presupposes some other space as the
condition of its limitation； and so on。 As regards limitation；
therefore； our procedure in space is also a regressus； and the
transcendental idea of the absolute totality of the synthesis in a
series of conditions applies to space also； and I am entitled to
demand the absolute totality of the phenomenal synthesis in space as
well as in time。 Whether my demand can be satisfied is a question to
be answered in the sequel。
Secondly； the real in space… that is； matter… is conditioned。 Its
internal conditions are its parts； and the parts of parts its remote
conditions； so that in this case we find a regressive synthesis； the
absolute totality of which is a demand of reason。 But this cannot be
obtained otherwise than by a plete division of parts； whereby the
real in matter bees either nothing or that which is not matter；
that is to say； the simple。 Consequently we find here also a series of
conditions and a progress to the unconditioned。
Thirdly； as regards the categories of a real relation between
phenomena； the category of substance and its accidents is not suitable
for the formation of a transcendental idea； that is to say； reason has
no ground； in regard to it； to proceed regressively with conditions。
For accidents （in so far as they inhere in a substance） are
co…ordinated with each other； and do not constitute a series。 And；
in relation to substance； th