OF LIFE. 29 



*fl. It is spontaneous motility, (motilit6,J an inherent 

 faculty of living bodies. 



Q. What features serve to distinguish the two kinds of 

 contractility from each other? 



#. Animal contractility has its impulse from the brain, 

 submits to the influence of the will, ceases when the com- 

 munication of the organ with the brain is cut off, has its 

 seat in what are called the voluntary muscles, and pre- 

 sides over locomotion and the voice. 



Q. Place organic contractility in contrast with the ani- 

 mal. 



/?. It has no common centre, such as the brain is to ani- 

 mal contractility; it is uncontrolled by the will; finds its 

 principle in each contracting or moving organ; and pre- 

 sides over the digestive, secretory, absorbent, exhaling, 

 and nutritive phenomena. 



Q. What effects have sudden death and disease on these 

 contractilities? 



#. This death suddenly destroys animal contractility, 

 the organic remaining larger in existence. The effects of 

 disease may be seen in paralysis, where animal contracti- 

 lity is lost, while the organic remains. 



Q. What connexion have these contractilities with their 

 respective sensibilities? 



A. They arise from them, depend on them, inasmuch 

 as action is the result of sensation. 



Q. Is there not a difference in the relation of the two 

 to their respective sensibilities? 



&. There is; for the excitement of animal sensibility 

 does not necessarily induce animal contractility. For in- 

 stance, an impression made on a limb or set of muscles, 

 does not necessarily induce the motion of that member 



