NEW PLUMS AND PRUNES 149 



ters" is in reality made up of a multitude of 

 minor characters. 



Heredity carries all of these definitely from 

 one generation to another; so their potentialities 

 must be represented within the structure of the 

 chromosomes ; and there are by no means chromo- 

 somes enough to supply one for each hereditary 

 character. 



So we are obliged to assume that each 

 chromosome is in itself a complex structure, and 

 that within that structure there are subordinate 

 structures like the individual bricks and boards 

 and nails and rivets that go to make the struc- 

 ture of any piece of human architecture that 

 determine by their quality or their arrangement 

 the specific potentialities of the future organism. 

 Each chromosome, in other words, must be 

 thought of not as the tangible conveyer of any 

 particular "unit character," but as a receptacle 

 in which several or many factors or determiners 

 of diverse unit characters size of flower and 

 color quality of leaf and fruit and all the rest 

 are assembled. 



FURTHER AID FROM THE PHYSICIST 



But unfortunately the powers of the micro- 

 scope do not suffice to reveal these unit struc- 

 tures within the chromosome. 



