et ImbeciUitate Darwiniana. 23 



This vital difference is all in all. For under 

 Nature it must live by its form, and must 

 DIE, unless it can at all times keep itself 

 alive : but under art, it need not die, but 

 may live, whether its organs are good or 

 bad, useful or useless. Such forms as many 

 of those produced by art could not exist 

 for a day in a state of Nature. For under 

 art, useless or incipient structures can be 

 added up, cumbrous, futile, or even positively 

 injurious though they should be : but under 

 Nature, not so : it is IMPOSSIBLE. 



V. 



Consider, for example, the organisation, 

 ' hippopotamus,' which is the type of a class. 



Animals that live by inhaling and ex- 

 haling air, and yet pass much of their time 

 under water, MUST NECESSARILY possess 

 organs peculiarly constructed so as to enable 



