CiBAP. VI.] SUMMARY. 261 



acts by either now adapting the varying parts of each 

 being to its organic and inorganic conditions of life; 

 or by having adapted them during past periods of time: 

 the adaptations, being aided in many cases by the in- 

 creased use or disuse of parts, being afEected by the di- 

 rect action of the external conditions of life, and sub- 

 jected in all cases to the several laws of growth and 

 variation. Hence, in fact, the law of the Conditions of 

 Existence is the higher law; as it includes, through the 

 inheritance of former variations and adaptations, that of 

 Unity of Type. 



