168 HEREDITY AND ENVIRONMENT 



into those of the adult. From beginning to 

 end development is a series of morphological 

 and physiological changes but not of new for- 

 mations or creations except in so far as new 

 structures or functions appear as a result of 

 "creative synthesis." It is only the incomplete- 

 ness of our knowledge of development which 

 allows us to say that the eye or ear or brain 

 begins to form in this or that stage. They be- 

 come visible at certain stages, but their real be- 

 ginnings are indefinitely remote. 



II. Correlations Between Germinal and 

 Somatic Organization 



All the world knows that the organization 

 of the germ is not the same as that of the de- 

 veloped animal which comes from it, and yet 

 the specificity of the germ indicates that there 

 must be some correlation between the germinal 

 and the developed organization; in short, 

 there is not identity of organization but cor- 

 relation of organization between the germ and 

 the adult. What correlations are known to 

 exist between the oosperm and the developed 

 animal? 



