336 On the Distribution of Organized Beings in Time. 
Lamellibranchiate Acephala . Palliobranchiate Acephala. 
Echinoidea = 92". . . . '. -Grinoidea. 
6-starred Corals . . . . . 4-starred Corals. 
If we were to show by means of a 
detailed diagram the relations in each _ m Mi inate 
of these groups of the development of % st develop. of 
generic types to time, we should sym- & ca Ate 
bolise it by a cone or a pyramid, the an hie 
base or fullest portion of which should wate og Be oat 
be turned respectively towards the 4 \. produc- 
commencement of the Paleozoic, or _ 1 _ tion of. 
termination of the Neozoic epoch. The 4 i greta 
last example given will show this & re TERPS 
strikingly, though in most instances = ps aie ly 
the groups interlace. S ts ait aw 
Relations of this kind may be mani- & ao generic 
fested in a low degree, even within the © + type. 
range of a single group. 
From all these considerations, the numbers of species in a group 
or genus at any given epoch is to be excluded, not being an element 
in the discussion of the question, though apt to be introduced through 
mistake of the nature of the generalization attempted to be attained. 
There may appear to be a contradiction involved in the expression 
manifestation of polarity in time, for since time implies sequence or 
progression in one direction only, how can we connect with time an 
arrangement that involves the notion of progression in opposite direc- 
tions, proceeding from a median zero. : 
But time is an attribute with which man’s mind invests creation ; 
a mode of regarding Divine ideas, necessary for the conception of 
time by our limited faculties, and forming in itself no part or essence 
of the Divine scheme of organized nature. We speak of Polarity in 
Time, for want of a better phrase ; but this polarity, or arrangement 
in opposite directions with a development of intensity towards the 
extremes of each, is itself, if I am right in my speculations, an attri- 
bute or regulating law of the divinely originating scheme of creation ; 
therefore, strictly speaking, independent of the notion of time, though 
perceptible by our minds only in connection with it. 
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By a diagram such as the above we may fairly express this view, 
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