EPOCHS IN BIOLOGICAL HISTORY 393 



that some of his predecessors had reached a broad viewpoint 

 in anatomical study, but Cuvier's claim to fame rests on the 

 remarkable breadth of his investigations his grasp of the 

 comparative anatomy of the whole series of animal forms. 

 And not content merely with the living, he made himself the 



FIG. 203. Thomas Henry Huxley. 



first real master of the anatomy of fossil Vertebrates as was 

 his contemporary, Lamarck, of fossil Invertebrates. 



Cuvier's grasp of anatomy was due to his emphasizing, as 

 Aristotle had done before him, the functional unity of the or- 

 ganism: that the interdependence of organs results from the 

 interdependence of function : that structure and function are 

 two aspects of the living machine which go hand in hand. 

 Cuvier's famous principle of correlation "Give me a 

 tooth," said he, "and I will construct the whole animal" 

 is really an outcome of this viewpoint. Every change of 



