60 EVOLUTION AND SATURAL THEOLOGY. 



they are also all eye, in the sense that all parts 

 of their body are sensitive to the influence of 

 light. That the sense of sight should in the 

 course of time have been located in special 

 organs which would require to be adapted 

 for the purpose, and would be subject to 

 Natural Selection, is scarcely more surprising 

 than that limbs have taken the place of 

 pseudopodia in all animals except the very 



lowest. 



i 



II. " Natural Selection does not harmo- 

 nise with the co-existence of closely 

 similar structures of diverse origin." 



o 



As Mivart admits that this objection only 

 applies to the Origin of Species by Natural 

 Selection alone, it is unnecessary to consider 

 it here, our subject being not Natural Selection 

 per se, but Evolution. 



III. " There are grounds for thinking that 

 specific differences may be developed 

 suddenly instead of gradually." 



Two instances will suffice as illustrations. 

 Oyster spat taken from the British coast to 

 the Mediterranean, produces the spiny Mediter- 



