SEX-CHARACTERS ILLUSTRATED 71 



They live at different physiological rates; 

 the metabolism of the male is relatively 

 more intense. The ratio of katabolism to 

 anabolism is greater in the male than in the 

 female. We may quote a few sentences 

 from another biologist, who expresses the 

 same view. In his Sex Antagonism (1913), 

 Mr. Walter Heape writes : "The Male and 

 the Female individual may be compared in 

 various ways with the spermatozoon and 

 ovum. The Male is active and roaming, he 

 hunts for his partner and is an expender of 

 energy ; the Female is passive, sedentary, one 

 who waits for her partner and is a conserver 

 of energy." 



Perhaps the average differences between the 

 sexes may be summed up tentatively in this 

 tabular contrast 



MALE. 



Sperm-producer. 



With less expensive repro- 

 duction. 



More intense metabolism. 



Relatively more katabolic. 



Often with shorter life. 



Often smaller. 



Often more brilliantly 

 coloured and more de- 

 corative. 



Rising to more intense out- 

 bursts of energy. 



More impetuous and ex- 

 perimental. 



More divergent from the 

 youthful type. 



Often more variable. 



Making more of sex-grati- 

 fication. 



More combative. 



FEMALE. 

 Egg-producer. 

 With much more expensive 



reproduction. 

 Less intense metabolism. 

 Relatively more anabolic. 

 Often with longer life. 

 Often larger. 

 Often quieter in colour and 



plainer in decoration. 



Capable of more patient 

 endurance. 



More persistent and con- 

 servative. 



Nearer the youthful type. 



Often less variable. 

 Making more of the family. 



Consolidating the family. 



