10 THEORY OF ORGANIC EVOLUTION. 



products always appear with a definite character of 

 adaptation to environment. 



Then, as the idioplasmic body becomes continu- 

 ally more complex in the further course of phylog- 

 eny, and consists of a greater number of groups of 

 micellae differing from each other, the organisms 

 become more complex and differentiate into a greater 

 number of parts, because each group of micellae of 

 the idioplasm produces its specific effect with regard 

 to inner structure, outer form, and function. 



7. DETERMINANTS: THEIR ORIGIN AND DISAPPEARANCE. 



Since a particular cluster or group of micellae of 

 the idioplasm produces a particular phenomenon in 

 the organism, the former is designated as the deter- 

 minant (Anlage, see p. 49) of the latter. Thus the 

 organism must contain at least as many determin- 

 ants in its idioplasm as there are different phenom- 

 ena in its inheritable ontogeny ; and if new phenom- 

 ena appear in it, new clusters of micellae must pre- 

 viously have been introduced into the idioplasm, or 

 the orientation and arrangement of clusters already 

 present must have been changed. The formation 

 of such a determinant, whether it concerns the per- 

 fecting of the organism or its adaptation to envi- 

 ronment, always proceeds very slowly, and as a rule 

 has no effect before its completion. Hence along 

 with perfected determinants the idioplasm always 

 contains growing and incomplete determinants. 



