308 GENERAL ZOOLOGY 



into the brain. The circumstances that the body of the 

 mother nourishes both the embryo and the infant brings 

 her into an organic relationship to family different to. the 

 casual relationship of the male.' 7 * 



In the choosing of a mate the initiative is taken by the 

 man. The primitive native of New Guinea adopts the 

 simple expedient of killing the man who already possesses 

 the woman he wants. In China and Turkey women are 

 sold to men who may desire them. If men are to do the 

 choosing, women must be attractive in order to be selected, 

 and the gentler sex has developed charming qualities, both 

 natural and artificial. The New Guinea woman dresses 

 her hair' by rolling strands in bright-colored clays in order 



/ 



FIG. 109. The races of men Mongolian, Caucasian, Negroid. 



that she may be more beautiful. Civilized women show 

 the same instinct in their elaborate dresses, bright hats, 

 ear rings, necklaces, and other ornaments. Forel, the 

 eminent Swiss scientist, believed that many of the basic 

 psychological processes of the human mind had their origin 

 in the desire of the two sexes to appear well in each other's 

 eyes. 



A human being follows the same course of development 

 as other metazoans. In a mature woman an egg cell leaves 

 the ovary and starts down the oviduct about every four 

 weeks. If fertilization does not occur within about two 

 weeks, the egg cell passes out and is later succeeded by 

 another. If a sperm cell unites with an egg cell, the result- 

 ing zygote adheres to the mucous lining of the uterus and 

 development begins. After the usual cleavage stages 

 (Fig. 64, page 152) a little streak (the primitive streak) 



* "Biological Aspects of Human Problems," N. Y., 1911. 



