1893.] Embryology. — 1103 
lies in the ovum; the ontogeny is not true epigenesis but rather an 
evolution, since the protoplasm at the first has a tendency toward direc- 
tion, is an-isotropic ; this initiates the subsequent actions and interact- 
ions of parts. 
This branch of biological study thus leads back only to something 
having determined form, not to a physicochemical starting point; the 
problems of morphology are not physicochemical problems. 
