32 Instinct. 



has yet been made and its results should be honest 

 ly accepted. 



The comparison of man's anatomical structure 

 with that of the lower orders of animals, has been 

 most perfect and satisfactory. The whole verte- 

 brate series is bound together with such homolo- 

 gies of structure that no casual observer even, can 

 fail to recognize the unity of plan. A careful ex- 

 amination of the structure of man reveals not a sin- 

 gle essential bone or organ that is not found in the 

 lower members of the vertebrate group. If we take 

 man as the perfection of the vertebrate type, then 

 it is proper to say that every essential organ in the 

 structure of the vertebrate anima)s is simply a mod- 

 ification of some organ found in man, either in his 

 mature or early state. This comparison has been 

 made so many times that the results are accepted 

 as those products of science which no man of com- 

 mon intelligence is expected to deny. If there is 

 doubt on any point, the materials are abundant for 

 re-examination of the subject. Every bone, tissue 

 and organ in the human body can be compared w^ith 

 the corresponding part in each one of the distinct 

 vertebrate types within a year, by hundreds of men 

 in different parts of the world. A new animal dis- 

 covered can be compared with those already known 

 and the modification of every organ be noted. 

 This correspondence of bone and muscle seems to 

 say that Creative Power seeks simplicity tJirough 

 unity of plan. He makes a hand, a foot, a wing or 

 fin by the modification of the same organ, or more 



