82 ‘ANALYSIS OF THE FOUR PRINCIPLES. 
II. METHODS OF THE REFLEXIVE MODE OF EACH OF THE FOUR PRINCIPLES. 
Producing demarcation of habitudinal Producing intensified divergence in 
groups: habits of groups: 
Reflexive partition. Reflexive election. 
Conjunctional partition. Conjunctional election. 
Institutional partition. Dominational election. 
Institutional election. 
Producing demarcation of racial groups: Producing intensified divergence in 
racial characters: 
Reflexive isolation. Reflexive selection. _ 
Conjunctional isolation. Conjunctional selection. 
Impregnational isolation. Dominational selection. 
Institutional isolation. Impregnational selection. 
Institutional selection. 
Prudential selection. 
These adjectives designate the methods of action by which the 
members of an associating and intergenerating group influence each 
other in such a way that the attainment of certain standards of train- 
ing and of inheritance are necessary to gain a full share in shaping the 
habits of the group and in propagating the species. But if partition 
and isolation divide the original group into two or more associating 
and intergenerating groups, the way is opened for divergence between 
the separate groups; for the standards gained by reflexive selection 
and reflexive election are all subject to gradual divergence through the 
fact that different standards of size, weight, etc., may bring survival 
and success to the separate groups in which these differences are 
found. For example, the bantam fowl, which for many generations 
has been isolated from the other breeds of barnyard fowls, lays an egg 
smaller than that of the Shanghai fowl; but the codrdination between 
the average size of the egg and the average size of the breed of 
fowls laying the egg is equally attained in each case by filio-parental 
selection, which is one of the forms of conjunctional selection. 
In our investigation of the different methods of influence resulting 
in segregation, it will greatly facilitate our comprehension of the sub- 
ject if we first consider how a given method of influence determines 
certain forms of selection; then how far the same method of influence 
shapes the forms of election determining the acquired characters of 
the group; then what its isolating effects may be; and finally how the 
same method of influence may divide an original group of freely asso- 
ciating individuals into several smaller groups and so produce partition. 
Having mentioned the chief methods of the reflexive influences aiding 
in the demarcation and intensification of habitudinal and racial 
