44 



SOCIAL EVOLUTION 



stages of its growth, and tlio embryos of a number of 

 other vertebrates. Figure 11 shows how the embryo 



n 



dvl^roRe^<iodc^diiH\ii&'. 



Fkjiri; !). Front View of Adult Iluinaii Sacnini. showing iilniorma! per- 

 sistence of Vestigial Tail-muscles. 



of man is closely related to the embryo of lower forms, 

 where in stages I and II many features of the human 

 embryo are reminiscent of its fishlike early ancestors. 

 There is an epigram among zoologists that the individual 

 climbs up its own genealogical tree. This bears, of 

 course, only a general interpretation. Yet, there is lit- 



