i8 



PROBLEMS OF EVOLUTION 



various classes of animals is intended to serve two purpose* 

 first to show that embryologists have discovered facts for whic 

 only the theory of evolution can account, and secondly to mak 

 some of my subsequent chapters easily intelligible to the genen 

 reader. 



FIG. 7. Human embryo. (After Haeckel.) 

 o, ear; 3, kz, ki, gill arches; bv, fore 

 limb ; M, hind limb. 



