GENESIS OF THE NERVOUS SYSTEM 



37 



The life of nutrition germinates from the interior 

 covering, and this in man becomes lungs, digestive 

 apparatus, nerves, intelligence, etc. 



The epithelial cells which constitute the external 



FIG. 1. 



Ciliated gastrula of Olynthus (chalk-sponge), o, round aperture ; 

 g, digestive cavity lined by the entoderm (e). 



covering of the gastrula are the registers of all the 

 rhythms, and in the bosom of the infinity of energy 

 the epithelial cells are a docile instrument which 

 inscribes in the easy and simple pentagram of its 

 organisations the primary harmonies of organic 

 evolution. 



