TABLE VIII. 



Systematic Survey of the Periods in Human Germ-history. 



(Cf. Table XXII.) 



• FIEST MAIN DIVISION OF GERM-HISTORT. 



Man as a simple Flastid. 



The hnman embryo possesses the form-value of u simple individual of tlic 

 Bret order of a single plastid. 



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



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

 loss of the germ-vesicle). 



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



The human germ is a simple cell (the impregnated ovulc-ocll with tho 

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



BECOND MAIN DIVISION OF GERM-HISTORY. 



Fan as a many-celled Primitive Aniu'fll. 



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

 UG uigaus; it therefore possesses the form-value of an individual of the 

 second order. 



Third Stage: Morula 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 of animal cells, 

 its contents of vegetative c»i^ 



