232 DETAILED SYNTHESIS. 



415. WHEN THE BRAIN DIMINISHES IN ADVANCED 

 YEARS, the size of the entire skull correspondingly dimin- 

 ishes. 



416. WHEN THE BONES ARE BROKEN, gristly tissue 

 is laid down in the form of a plug within the fractured 

 bone, and in the form of a ferule or ring (callous) on 

 the outside of it, holding the broken ends in place, after 

 which bony tissue is deposited between the broken ends 

 and united with them. When this process is complete 

 the cartilaginous plug and callous are removed so com- 

 pletely that at times no trace of the fracture is left. 



417. THE REPAIRING OP BONE is a long process, re- 

 quiring several changes in the repaired parts, and quite 

 an amount of nutritious material of the ossific sort. It 

 should be attended by a hearty appetite. Fortunately, 

 at such times, other parts may be at rest without injury 

 to themselves or causing irregularity in the bowels, kid- 

 neys, or other organs ; which is a wonderful provision, 

 as if it was anticipated that accidents must happen. 



418. THE FACTS MENTIONED IN REGARD TO CHANGES 

 IN THE BONES SHOW that there is a unitary power su- 

 perintending the action that takes place in them, increas- 

 ing action and diminishing it in the various parts, 

 according to the necessities of the part and the welfare 

 of other parts. 



419. THE NECESSITY FOR A UNITARY SUPERIN- 

 TENDING POWER is SUPPLIED by means of the nerves 

 that extend from every part of the bones to the nerv- 

 ous centres. 



420. THE OSSEOUS NERVES ARE DOUBTLESS of two 

 kinds, Sympathetic and Sensatory, though only the lat- 

 ter can be demonstrated. 



421. THE NERVES EXTENDING FROM THE BONES PRO- 

 DUCE sensation only when the bones are diseased, or 

 after they have been broken a little while. 



415. What effect ? 416. What occurs ? 417. What said of ? 418. What 

 do ? 419. How is ? 420. What ? 421. What do ? 



