494 The Polar Organization of Animals. [May, 
but slightly or not at all displayed. In animals of somewhat 
higher organization, in which the polarities have become mort 
localized, their effect upon the form is still largely masked bythe 
influence of environing relations. Yet, though the poles assume 
ciple of organization is usually manifest. In the higher animal 
tribes the polar force asserts itself positively, and the resultisa | 
harmonious combination of functions arising from two sets 
fluences, those of external nature and those of the internal oF 
ganic conditions. The formative energies inherent in protoplast | 
assert themselves against the irregular influences of the ae 
world, and produce in the highest animal a form of marked sy 
metry. a 
The polarity. of the animal body is, in fact, fourfold in a som 
what fuller sense than here indicated, Each of the longitudi 
poles is a double organ, so that each Jateral half of the body 
sesses its longitudinal poles. And the brain of each si 
directly connected with and controls the organic functions isi 
other half. There is thus a cross relation between the anteni 
and posterior poles. Each lateral half is, in a double sense, 
to the other half, and each may be looked upon as the repre 
tive of one of the parental organisms. 
In the highest animals the action of the external forces 
harmonize with, not oppose these internal energies. Pi 
ties are not distinctly localized in the lowest animals, and the 
little resistance to the action of external influences. ` The 9% 
molded from without. But significantly, of the sya 
animal development, the vertebrate, that in which lateral an 
gitudinal polarity is most declared, has progressed far be: 
less symmetrical lines. With every step of development 
fluence of the polar tendencies grows more declared, W 
molding agency of external force is more and ne 
superficial variations. In man the organization 1s mar et: 
and the molding influences of external nature arè > 
to the influence of the internal tendencies. : 
There is a minor phase of this organic polarity yr ‘ 
brief allusion is desirable. In a former paper the I ail 
oxygen on the body was considered, and the pa ai 
genation and nutrition shown. Oxygen, in fact, 15 From 
the motor function, and the constant foe of nutna 
