EXPERIMENTAL MORPHOGENESIS 



125 



order : we may call this order the " relation of localities in 

 the absolutely normal case." If we keep in mind that the 

 term "prospective potency" is always to contain this order, 

 or, as we .may also call it, this " relative proportionality/' 

 which, indeed, was the reason for calling our systems 

 " harmonious," then we may apply it without further ex- 

 planation in order to signify the non-variable factor on 



dl 



FIG. 11. DIAGRAM TO SHOW THE CHARACTERISTICS OF AN 

 " HARMONIOUS-EQUIPOTENTIAL SYSTEM." 



The element X forms part of the systems a b or i &i or a 2 bo ; its prospective value is 

 different in each case. 



which the prospective value of any element of our systems 

 depends, and, if we denote the prospective potency, embrac- 

 ing order, by the letter E, we are now able to complete our 

 formula by saying p.v. (X) =f (s, I, E). 



So far the merely analytical study of the differentiation 

 of harmonious-equipotential systems. 1 



1 A far more thorough analysis of this differentiation has been attempted 

 in my paper, ' ' Die Localisation morphogenetischer Vorgange. Ein Beweis 

 vitalistischen Geschehens," Leipzig, 1899. 



