1. "In each large group the general is formed 

 earlier than the special." The most general 

 for all animals is considered to be that 

 opposition between the external surface, 

 directed towards the surrounding media, and 

 the internal surface. Therefore it is 

 absolutely natural that the general original 

 form represents a hollow circle, or vesicle. 



2. "From the general the less general is formed 

 and so on, until at the end the very special 

 appears. " 



3. "Each embryo of a certain animal form, instead 

 of passing through other defined forms, 

 deviates from them." 



4. "The embryo of higher forms is similar not to 

 the other animal form, but only to its embryo." 

 (320 - 321 (224)) 



The superficial similarity of the embryos of higher animals 

 to the adult lower animals depends on the fact that the 

 latter are little differentiated and therefore not so far 

 from the embryonic condition. 



The transition in individual development by means of 

 divergence from the more general form to the more special 

 Baer illustrated by his schema, "Illustration of the course 

 of development" (227) . 



355 



