ANIMAL LIFE FORMATION. 287 



begun. The vertebral column determines es- 

 pecially the dorsal part and protects it pass- 

 ively, while the fleshy ventral part has active 

 protection (arms and feet, senses, etc.). Again 

 we see that Life unifies Nature's twofoFd- 

 ness; the outside is dual, but the process is 

 one. We shall find that bi-lateralisrn reaches 

 some of the bodily organs and not others ; the 

 ground of such a distinction is suggestive and 

 will be touched upon later, when we have seen 

 the prime organic differentiation of the Ani- 

 mal Form. 



3. The Animal Organism Differentiated. 

 From the foregoing dual formation of the Or- 

 ganism we return to the latter as a whole for 

 the purpose of considering its constituent 

 parts Trunk, Extremities and Head. Now 

 each of these parts has its own bi-lateral sym- 

 metry, though they are not symmetrical with 

 one another. The three are constituents of 

 one animal Form which is continually repro- 

 ducing itself through nutrition. Each has its 

 own character and connection with total Life : 

 the Trunk is in general directed inward and is 

 more vegetal, the Extremities are directed 

 outward with power of self-movement and are 

 more animal, the Head is the rounding out of 

 the organism externally and internally, being 

 directive and self-directive, and so is in itself 

 more mental. Thus the human organism is a 



