THE EVIDENCE FOR ORGANIC EVOLUTION 



501 



Fig. 264. — Wing of pterodactyl, an extinct flying reptile; of a mammal, the 

 bat; and of a bird, sho\dng three modifications of the appendage (cf. Fig. 18, 



p. 39). 



(From Romanes, "Darwin and after Darwin," copyright, 1S96, by Open Court Pub- 

 lishing Co., reprinted by permission.) 



