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hostile to heterogeneity in phenomena； and have their eyes always
fixed on the unity of genera； while others… with a strong empirical
tendency… aim unceasingly at the analysis of phenomena； and almost
destroy in us the hope of ever being able to estimate the character of
these according to general principles。
The latter mode of thought is evidently based upon a logical
principle； the aim of which is the systematic pleteness of all
cognitions。 This principle authorizes me； beginning at the genus； to
descend to the various and diverse contained under it； and in this way
extension； as in the former case unity； is assured to the system。
For if we merely examine the sphere of the conception which
indicates a genus； we cannot discover how far it is possible to
proceed in the division of that sphere； just as it is impossible； from
the consideration of the space occupied by matter； to determine how
far we can proceed in the division of it。 Hence every genus must
contain different species； and these again different subspecies； and
as each of the latter must itself contain a sphere （must be of a
certain extent； as a conceptus munis）； reason demands that no
species or sub…species is to be considered as the lowest possible。 For
a species or sub…species； being always a conception； which contains
only what is mon to a number of different things； does not
pletely determine any individual thing； or relate immediately to
it； and must consequently contain other conceptions； that is； other
sub…species under it。 This law of specification may be thus expressed：
entium varietates non temere sunt minuendae。
But it is easy to see that this logical law would likewise be
without sense or application； were it not based upon a
transcendental law of specification； which certainly does not
require that the differences existing phenomena should be infinite
in number； for the logical principle； which merely maintains the
indeterminateness of the logical sphere of a conception； in relation
to its possible division； does not authorize this statement； while
it does impose upon the understanding the duty of searching for
subspecies to every species； and minor differences in every
difference。 For； were there no lower conceptions； neither could
there be any higher。 Now the understanding cognizes only by means of
conceptions； consequently； how far soever it may proceed in
division； never by mere intuition； but always by lower and lower
conceptions。 The cognition of phenomena in their plete
determination （which is possible only by means of the understanding）
requires an unceasingly continued specification of conceptions； and
a progression to ever smaller differences； of which abstraction bad
been made in the conception of the species； and still more in that
of the genus。
This law of specification cannot be deduced from experience； it
can never present us with a principle of so universal an
application。 Empirical specification very soon stops in its
distinction of diversities； and requires the guidance of the
transcendental law； as a principle of the reason… a law which
imposes on us the necessity of never ceasing in our search for
differences； even although these may not present themselves to the
senses。 That absorbent earths are of different kinds could only be
discovered by obeying the anticipatory law of reason； which imposes
upon the understanding the task of discovering the differences
existing between these earths； and supposes that nature is richer in
substances than our senses would indicate。 The faculty of the
understanding belongs to us just as much under the presupposition of
differences in the objects of nature； as under the condition that
these objects are homogeneous； because we could not possess
conceptions； nor make any use of our understanding； were not the
phenomena included under these conceptions in some respects
dissimilar； as well as similar； in their character。
Reason thus prepares the sphere of the understanding for the
operations of this faculty： 1。 By the principle of the homogeneity
of the diverse in higher genera； 2。 By the principle of the variety of
the homogeneous in lower species； and； to plete the systematic
unity； it adds； 3。 A law of the affinity of all conceptions which
prescribes a continuous transition from one species to every other
by the gradual increase of diversity。 We may term these the principles
of the homogeneity； the specification； and the continuity of forms。
The latter results from the union of the two former； inasmuch as we
regard the systematic connection as plete in thought； in the ascent
to higher genera； as well as in the descent to lower species。 For
all diversities must be related to each other； as they all spring from
one highest genus； descending through the different gradations of a
more and more extended determination。
We may illustrate the systematic unity produced by the three logical
principles in the following manner。 Every conception may be regarded
as a point； which； as the standpoint of a spectator； has a certain
horizon； which may be said to enclose a number of things that may be
viewed； so to speak； from that centre。 Within this horizon there
must be an infinite number of other points； each of which has its
own horizon； smaller and more circumscribed； in other words； every
species contains sub…species； according to the principle of
specification； and the logical horizon consists of smaller horizons
（subspecies）； but not of points （individuals）； which possess no
extent。 But different horizons or genera； which include under them
so many conceptions； may have one mon horizon； from which； as
from a mid…point； they may be surveyed； and we may proceed thus；
till we arrive at the highest genus； or universal and true horizon；
which is determined by the highest conception； and which contains
under itself all differences and varieties； as genera； species； and
subspecies。
To this highest standpoint I am conducted by the law of homogeneity；
as to all lower and more variously…determined conceptions by the law
of specification。 Now as in this way there exists no void in the whole
extent of all possible conceptions； and as out of the sphere of
these the mind can discover nothing； there arises from the
presupposition of the universal horizon above mentioned； and its
plete division； the principle： Non datur vacuum formarum。 This
principle asserts that there are not different primitive and highest
genera； which stand isolated； so to speak； from each other； but all
the various genera are mere divisions and limitations of one highest
and universal genus； and hence follows immediately the principle：
Datur continuum formarum。 This principle indicates that all
differences of species limit each other； and do not admit of
transition from one to another by a saltus； but only through smaller
degrees of the difference between the one species and the other。 In
one word； there are no species or sub…species which （in the view of
reason） are the nearest possible to each other； intermediate species
or sub…species being always possible； the difference of which from
each of the former is always smaller than the dif