142 EVOLUTION, SOCIAL AND ORGANIC 



he would have been able to still perceive that 

 distinction in dealing with those ant and bee 

 communities where Haeckel got lost, there is 

 nothing to show. 



Spencer's middle-class predilections come 

 out strongly, and a very pretty physiological 

 justification is provided for that wholly ad- 

 mirable section of the community. 



The first step in the development of an em- 

 bryo is its division into two main layers of 

 cells — the mucous layer and the serous layer, 

 The mucous layer, that fine inside skin of the 

 body so to speak, absorbs nutriment. But 

 that nutriment must be transferred to the 

 serous layer which builds up the nerves and 

 muscles. Presently there arises between these 

 two a third — the vascular layer. Out of this 

 third layer the chief blood vessels are de- 

 veloped and these vessels serve to transport 

 the nutriment from the inn^r or mucous layer, 

 which gathers it, to the outer or serous layer, 

 which uses it for the whole organization's up- 

 building. 



"Well," says Spencer, "may we not trace a 

 parallel step in social progress? Between the 

 governing and the governed, there at first exists 

 no intermediate class; and even in some so- 

 cieties that have reached considerable size, 

 there are scarcely any but the nobles and their 



