STOP OK CLICK MECHANISM IN THE ANIMAL KINGDOM. 213 



mechanical work. Only then can these primary ideas bear 

 fruit when he knows how to adapt them. Unfortunately, too 

 often through thoughtless copying of nature many valuable 

 ideas become useless. 



Natural philosophers have long acknowledged that the ex- 

 perience and knowledge of the scientist is absolutely necessary 

 for them. The same laws by which our houses and machinery 

 are built come also into play in the growth of the animal 

 body. Only an exact knowledge of these laws can bring us to 

 a deeper understanding of the whole formation of the animal 

 body. Therefore it appears to be of the highest importance 

 that the relations between the natural philosopher and 

 scientist should be more close than they have been up till 

 now. 



