FORMS OF SELECTION. 199 
organisms better adapted than their rivals of the same intergenerant 
to the natural laws and conditions of the environment, or to the nat- 
ural constitution of the species to which they belong. The former I 
’ call rational selection and the latter adaptational selection. Under the 
former I place artificial [prudential] and institutional selection, and 
under the latter I place processes as unlike as natural selection and 
sexual selection. This classification does not, however, seem to me 
so important or so fundamental and clearly definable as that which 
rests on the fact that some forms of selection depend on the relations 
in which organisms stand to the environment, while others depend on 
the relations in which the members of the same species stand to each 
other. It may here be noted that artificial selection is the exclusive 
generation of those that are better fitted to the rational environment, 
through the failure to propagate of those that are less fitted. The 
effect is the same whether the failure to propagate is through lack of 
adaptation to human purposes or through lack of adaptation to the 
unreasoning environment. 
The following table of the forms of selection will, I think, be a help in 
maintaining these and other distinctions. 
ForRMS OF SELECTION. 



z ADAPTATIONAI, SELECTION. RATIONAL SELECTION. 
fe) 
5 ~ . Active (or endonomic) selection. ce Teteronomic selection. 
ag 8 ay at) . 
BoE Habitudinal selection. Zs Artificial selection. 
ao5 Nati 5 ; oo ‘ 
2 s ptitudinal selection. a's Conecious. 
Sal a eae ALN pe "a 
pe ; : 
m fo assive or heteronomic selection. a Winboreeous: 
= Natural selection. 
aq 
Conjunctional selection. Institutional selection. 
Sexual selection. Ecclesiastical selection 
Social selection. Military selection. 
Filio-parental selection. Sanitary selection. 
Bey vs ; Penal selection. 
Dominational selection. 
Prepotential domination. 
Sustentational domination. 
Protectional domination. 
Nidificational domination. 
Nuptial domination. 
Prudential selection. 
REFLEXIVE SELECTION. 
Impregnational selection. 
Dimensional selection. 
Structural selection. 
Potential selection. 
Fecundal selection. 
Balanced and unbalanced. 
