TABLE XXII. 



SYSTEMATIC SURVEY OF THE PERIODS IN THE TRIBAL HISTORY OF THE 



HUMAN RACE. 

 (Compare Table VIII., vol. i. p. 402.) 



FIRST MAIN PERIOD IN TRIBAL HISTORY. 



The Plastid Ancestors of Man. 



The form of the ancestors of man is equal to the simple individual of the 

 lrst order, a single plastid. 



First Stage : Moneron Series (Fig. 163, p. 46). 

 The ancestors of man are single, living, simple cytods. 



Second Stage : Amceoa Series (Fig. 167 p. 58). 

 The ancestors of man are single, living, simple cells. 



SECOND MAIN PERIOD IN TRIBAL HISTORY. 



The many-celled Primitive Animal Ancestors of Kan. 



The ancestors of man consist of a closely-nnited society of many homo- 

 geneons cells ; hence their form-value is that of individuals of the second 

 order, of Idorgana. 



Third Stage : Synamceba Series (Fig. 170, p. 55). 



The ancestors of man are many-celled primitive animals of the simplest 

 kind : solid masses of simple, homogeneous cells. 



Fourth Stage : Plansea Series (Figs. 172, 173, p. 60). 

 The ancestors of man are many-celled primitive animals of a character 

 like that of the Magosphcera and certain planula-larvae, of equal rank with 

 the ontogenetio Blastula or Blastosphcera ; hollow spheres, the wall of which 

 consists of a single stratum of ciliated cells. 



