'6V1 PttOCJiliDINUS Ui' TliE ACADEMY OF [1885. 



main methods of escape, and swift pursuit the principle of 

 attack, while claws were added to teeth as assailing weapons. 

 Finally mentality came into play, intelligence became the most 

 efficient agent both in attack and defense, and a special develop- 

 ment of the mind began. As a culmination of the whole, we 

 have man, in whom mentality has replaced all other agents 

 in the struggle for existence. But side by side with man all the 

 other types exist, the soft-bodied, the armored, the swift-moving, 

 and those in which cunning precedes the higher mentality. In 

 the existing conditions of life upon the earth we have an epitome 

 of the whole long course of evolution. 



