Male and Female. 175 



becomes fierce and determined, delights in expend- 

 ing his masculine activity in frightful encounters 

 with his rivals, and at all times is easily excited to 

 irascibility. The cow, on the other hand, gives up 

 youthful sportiveness, does not as a rule show an 

 active desire to engage in combat, unless her calf 

 is in jeopardy, when she will valiantly defend it. 

 Instead of growing more active, she grows less 

 active. 



As a result of physical changes in the vocal 

 organs the voice also changes at maturity. 



The senseless baa of the calf becomes the sono- 

 rous low of the cow, or the harsh and terrifying 

 bellow of the bull. 



All through the mammalian life corresponding 

 changes are more or less evident. Young lions 

 are pretty and innocent pets, playful, and as a rule 

 good-natured, — like all babies. The two sexes 

 closely resemble each other, neither having the 

 characteristics which mark the adult forms. At 

 reproductive maturity, there emerges from the 

 universal babyhood, on the one hand the feminine, 

 slender, more docile female ; on the other the 

 distinctly masculine, powerful male with his im- 

 posing mane, — his helpless baby cry grown into 

 a roar that strikes terror to the heart. 



In our familiar friend, the domestic cat, the 

 change is not so much in form as in disposition, the 

 male evincing greater restlessness and pugnacity. 



The dog at this period loses his puppy voice, 



