518 



THE THEORY OF EVOLUTION 



flourishing condition. The only survivors are the African ele- 

 phants and the species native to Southern Asia. 



RECENT 



£/epfia^ '/a 



S^e^oc/on '/q 



Mo&todoT) '/q 



PLEISTOCENE 



UPPER PLIOCENE)] 



LOhfEHPLIOCE/VE \Gomphorf,er;um 



UPPER MIOCENE ] ^-"""'IZ) 

 MIDDLE M/OCENE \ 



Hi(jrotion into ( Gomphol/ien'um 



t, , A I onguiTiden^ shoe 



North Am,nca {/onu chw)J^ 



Qom}Utlcr,um '/& LOh/ER MIOCENE] 

 UPPER OUGOCENE 



LOWER OL/GOCENE 



PaloeomoiTodon 'fy UPPER EOCENE 





rolaeomaitodon 

 (Jen^lhtnino chin) 



i/oerit/ier/um /^ 



\ Eloerilhenum 



MIOOLE EOCENE \ {short c/,m) 



L OfVf/i EOCEA/E (ancestor unHno»'n). 



Fig. 278.— Evolution of the elephant from the Eocene Period or early 

 Tertiary (c/. Time-scales, Figs. 259 and 276). 



(From Scott, "Land Mammals of the Western Hemisphere," copyright, 1913, by The 

 Macmillan Co., reprinted by permission.) 



Synthetic Types. — It is sometimes said by critics of evolution 

 that the " missing hnks " which should exist are not forthcoming. 



