36 SUPEK-ORGANIC EVOLUTION 



tion a distinct form, the neurona, which is a 

 distinct cell, will obey a distinct rhythm, and 

 as rhythms in the course of time and space 

 go on developing and combining and becoming 

 more complex, it is natural, also, to think that 

 the nervous cell, which in its chronological 

 order is later in appearance, is also the most 

 complex, as is testified by its composition and 

 import. It can be affirmed that the neuronas 

 are the result of the most complex rhythms which 

 give life to the animal world, but, like every- 

 thing else, they are in harmony with the universal 

 mechanics. 



The cellular organism, on becoming polycellular 

 and multiplying its elements, allows a better rela- 

 tion or concordance with the external. Hence 

 a better adaptation to the rhythms and the 

 differentiation follows in increasing progression. 

 When the polycellular organism becomes gastrula 

 a marked differentiation is seen between the ex- 

 ternal covering or ectoderm, and the internal or 

 entoderm ; the first, in intimate relation with the 

 external, receives more varied rhythms than the 

 internal part hence follow completely different 

 functions. 



In the external covering the life of relation takes 

 place, and there is the germ which becomes the 

 skin, senses, nerves, and intelligence of man. 



