: \ \ LA.... 



7"! "i t 5 * T 9 ■) '0 " 



Fig. 6o. — Comparison of hypothetical forms of the skull in the ancestry of 

 the horse (C — E), constructed by applying the method of Cartesian trans- 

 formation (A — H) with actual forms ; (M) Mesohippus ; (Mi) Miohippus ; 



(Pa) Parahippus ; (P) Protohippus. 



109 



