308 BIOLOGICAL PHYSICS 



This line of demarcation, marks the most important 

 departure, from the hitherto existent cellulo-nervine, and 

 sympathetically fibre-nervine, manners, of vitalisation, 

 and innervation, thus far common both to animal, and 

 vegetable, organisms, and forms the foundation, on 

 which the evolution of the systemic nervous system, 

 in all its parts, and varieties, and in all its degrees of 

 simplicity, and complexity, from the insect to man 

 himself, is wrought out, and perfected ; it, moreover, 

 forms the stepping stone, to that high organic platform, 

 on which have been wrought out, and evolved, the higher 

 physiological, or intellectual, qualities, and attainments, 

 and the highest of all human characteristics, the moral 

 qualities, with the implantation of that craving, after the 

 gratification, if not entire satisfaction, of the uniquely 

 human conception of immortality. 



Life, and all that it primarily means, on the earlier, 

 or rudimentary, side, of this somewhat arbitrary line of 

 demarcation in neuro-genesis, is first, confined within 

 intra-cellular limits, and second, is limited to inter-cellular 

 proportions, in addition to the intra-cellular, when cells 

 have sufficiently increased to require organisation ; in the 

 cellulo-genetic process. Segmentation of the parent cell 

 is regarded as due to nuclear selection, and disposition, 

 of the cell protoplasm, whereby its vitalised, and inner- 

 vated, molecular constituents, are segmented, and prepared 

 for independent existence, with every attribute of the 

 original cell reproduced, and capable of repeating the 

 process. The parent cell, in the process of sympathetic 

 neuro-genesis, may be regarded, as maintaining a, more 

 or less, prolonged, or temporary, structural connection, 

 with its segmented, and differentiated, progeny, in all 

 varieties of organised cell groups, or textures, in virtue 

 of a, more or less, sustained intercellular continuity, or 

 quasi-nervine connective tissue. The highest stage of 

 this type of neuro-genesis, is reached, in the complex 

 organisms of the highest types of plant life, in the non- 

 systemic nervous system possessed members of the animal 

 kingdom, and in the sympathetic nervous system controlled 

 textures of the systemic nervous system possessed animal 

 world. 



