206 SUPER-ORGANIC EVOLUTION 



Every sensation contains a double nervous 

 current : first, from the periphery of the body to 

 the nerve-centres; this one, from the direction of 

 the current, is called centripetal, and, from its 

 quality, sensitive ; when once this current reaches 

 the point of its central localisation there is relief, 

 and from centripetal the current becomes centri- 

 fugal, and from sensitive, motive. If one of these 

 currents is missing the nerve-process becomes nil. 

 The life of the nerve, its importance and delicacy, 

 can be understood throughout its extent ; knowing 

 how all external sensations from light, heat, 

 electricity, degree of moisture, etc. in a word, all 

 kinds of rhythms registered and carried to their 

 respective centres by the sensitive and centripetal 

 currents are transformed at the last term (fig. 23, b) 

 into a peculiar reaction upon the chemistry of each 

 cell. 



This gives an idea of the significance of the theory 

 of evolution, the relation of the external to the 

 internal, how the cosmic agents, the universal 

 energy, dominate the organisation of all beings, and 

 how every organisation is an echo of the science of 

 energy, in virtue of that exquisite quality of organic 

 matter for which all sensation is converted into 

 action, whether psychical, glandular, or muscular. 



The Spanish proverb, "It makes one's mouth 

 water," is well known. 



