TABLE VIII. 



SYSTEMATIC SuiiYEY OP THE PERIODS IN HUMAN GEBM-HIST011Y. 



(Cf. Table XXII.) 



FIEST MAIN DIVISION OF GEEM-HISTORY. 



Han as a simple Plastid. 



The human embryo possesses the form-value of a simple individual of the 

 first order of a single plastid. 



First Stage : Monerula Stage (Fig. 36, p. 210). 



The human germ is a simple cytod (the impregnated egg-cell after the 

 loss of the germ- vesicle). 



Second Stage : Cytula Stage (Fig. 37, p. 210). 



The human germ is a simple cell (the impregnated ovule-cell with the 

 re-formed kernel, or the parent-cell). 



SECOND MAIN DIVISION OF GEKM-HISTOEY. 



Kan as a many-celled Primitive Animal. 



The human embryo consists of many cells, which, however, as yet form 

 no organs ; it therefore possesses the form-value of an individual of the 

 second order. 



Third Stage : Morala Stage (Fig. 40, p. 212, and PI. II. Fig. 14). 

 The human germ is a globular cell-mass, of which one hemisphere consists 

 of animal cells, the other of vegetative cells. 



Fourth Stage : Blastula Stage (PI. II. Fig. 16). 



The human germ is a vesicle, the wall of which consists cf animal cells, 

 its contents of vegetative cells. 



