258 BIOLOGICAL PHYSICS 



natural evolutional lines, and by the natural evolutional 

 materio-dynamic machineries. 



The occurrence of these ossificatory changes appears to 

 depend on the deposition, amid the neuro-plasmic 

 material, at some exposed, or degenerate, part, of its 

 circulatory surroundings, of the saline ingredients of the 

 accompanying cerebro-spinal lymph, which, then, and 

 there, initiate, and continue, the resolution of the com- 

 bined lympho-plasmic elements, into cartilaginous, or 



FIG. no. TRANSVERSE SECTION OF COMPACT TISSUE (OF HUMERUS). 

 Magnified about 150 diameters. (Sharpey.) 



Three of the Haversian canals are seen, with their concentric rings; also the lacunae, 

 with the canaliculi extending from them across the direction of the lamellae. The 

 Haversian apertures had become filled with debris in grinding down the section, 

 and therefore appear black in the figure, which represents the object as viewed 

 with transmitted light. 



osseous, tissue, in accordance with the character of the 

 structural environments, and the strength and continuance 

 of the ossific evolutionary process. 



The nervous system, but more especially the systemic 

 motor nervature, seems to possess, within itself, the 

 materials, saline, or earthy, and plasmic, for the spon- 

 taneous development, when the formative conditions are 

 favourable, of cartilage, and bone, and, so, an explanation 

 is afforded of the scattered attempts at ossification, so 

 plentifully apparent in certain individuals, at certain times, 



