86 ANALYSIS OF THE FOUR PRINCIPLES. 
4. The Filio-parental Form of Selection and Election, and Family 
Partition. 
Filio-parental selection is due to the dependence of survival on the 
coérdination between the inherited needs, powers, and instincts of the 
young by which they are related to their parents and the inherited 
adaptations, powers, and instincts of the parents by which they are 
related tothe young. In my paper on Intensive Segregation I referred 
to the necessity for codrdination between the size of the child’s head 
and the size of the pelvis in the mother. 
In Science for December 24, 1897, page 942, G. A. Reid, of Southsea, 
England, calls attention to the increasing difficulty of childbirth in 
civilized women, resulting from the regressive selection occasioned by 
the skillful appliances of modern science. He says: ‘‘Indeed the 
recent advance of obstetric science has enabled so many of the other- 
wise unfit to survive among us for some generations past that now 
numerous women are quite incapable of parturition without instru- 
mental aid.”’ Ina note he adds: ‘‘It is not possible that the saving 
of so many narrow-hipped women and big-headed children can have 
left the race unaffected.”’ 
Filio-parental election is due to the necessity for coérdination be- 
tween the acquired habits of the young and the habits, instincts, and 
endowments of the parents in order to gain success and influence. 
The term ‘‘family isolation’? may be needed in describing the 
usual relationship of mates in certain species; but with mammals it 
has been found that in-and-in breeding, continued through many 
generations, tends to degeneration, and, therefore, to extinction. 
Family partition arises in so far as the separation of families leads 
to the formation of separate habits and acquired characters. It is 
doubtful whether the term “‘ filio-parental partition’’ is needed, as 
the term ‘‘ family partition’’ seems to be more appropriate. 
5. The Forms of the Dominational Method of Influence. 
Producing intensified divergence in the habits of groups: 
Dominational election. 
Producing intensification of racial groups: 
Dominational selection. 
Sustentational domination. 
Protectional domination. 
Nidificational domination. 
Mating domination. 
Prepotential domination. 
The dominational method of influence does not depend on superior 
adjustments to the environment, but is due to the power to outdo, 
