310 BIOLOGICAL PHYSICS 



nature, and origin, and have only been differentiated by 

 the incidence of environment, and the functional neces- 

 sities, flowing from the exigencies of varied organic 

 evolution. All organic life, including the systemic 

 nervous system possessed life, it will, thus, be obvious, is 

 embraced within the operation of the law, and has been, 

 and must be, evolved on lines determined by its all- 

 pervading, formative, and moulding influence, in trans- 

 forming the inorganic " dust of the earth," into the 

 teeming millions of living organisms, known to present- 

 day science, besides the multitudes, which have haunted 

 the solitudes, and peopled the busy places, of the 

 ancient world. 



The succeeding stages of neuro-genesis concern, the 

 appearance of a distinct, and great, advancement, in its 

 elaboration, and growing complexity, as the type of 

 organism mounts " the scale of being," and shows the 

 introduction, into the conduct of an absolutely auto- 

 matically working mechanism, of a principle of conscious, 

 and voluntary, control, of the most profound, and far- 

 reaching, character, and influence, as affecting the 

 individual organism, and the destiny of living things, and 

 as shaping the course of future evolution, in its bearing 

 on the advent of the human species, and the progress of 

 civilisation. 



The neuro-genetic stages, thus referred to, consist, in a 

 word, of the various phases of unicellular, or molecular, 

 innervation ; communo-cellular nervine association ; sym- 

 pathetically innervated, and controlled, organisation ; and 

 combined systemic cellulo-sympathetic organism. 



