66 



EVOLUTION, GENETICS AND EUGENICS 



organism presents corresponds, in a general way, with the length of 

 time during which the divergence has been going on. Thus we 



Fig. 5. — Skeleton of Dinornis gravis, ^ B nat. size. Drawn from nature 

 (British Museum). As separate cuts on a larger scale are shown, (1) the sternum 

 as this appears in mounted specimens, and (2) the same in profile, with its 

 (hypothetical) scapulo-coracoid attached. (From Romanes.) 



scarcely ever meet with any great departure from the typical form 

 with respect to one of the organs, without some of the other organs 

 being so far modified as of themselves to indicate, on the supposition 



