AUTONOMIC AND HETERONOMIC INFLUENCES. I4I 
forms of these three principles we are able to avail ourselves of the 
adjectives that have been used in designating the different forms of 
selection. This is a great aid in presenting the relations between the 
‘four principles in their different forms. 
In many of the places where the sign *.: (meaning caused by) is used 
after the forms of reflexive selection, it might with equal correctness 
be changed to .’. (meaning causing). For example, social selection 
may be described on the one hand as depending on the codrdination 
of social instincts and qualities, and on the other hand as buzlding 
up and maintaining the social instincts and the characters on which they 
depend. ‘Taking a special case: Without any possible method of 
recognizing each other there could be no social selection; but, on the 
other hand, when a new race is formed, it is social selection that seizes 
on some new and fluctuating character, emphasizing, intensifying, 
and rendering it permanent; and so, in an important sense, it may be 
said that social selection produces the recognition marks and calls 
and coérdinates them with the special instincts of the race that recog- 
nize these marks and respond to these calls. 
II. AUTONOMIC AND HETERONOMIC INFLUENCES. 
1. Autonomic Influences Include Endonomic and Reflexive Influences. 
The nomenclature given in this volume calls attention to the fact 
that endonomic selection is determined by habitudes and aptitudes for 
dealing with the environment, and is subject to diversity without any 
corresponding diversity in the environment; and that the forms of 
reflexive selection are determined by the necessity for sexual, social, 
and other codrdinations between the members of the same intergen- 
erating group, also undergoing change without reference to change 
in the environment. The forms of endonomic and reflexive selection 
are, therefore, brought together under the term autonomic selection, 
which sets them in strong contrast with heteronomic selection, which 
is always determined by conditions in the environment surrounding 
the intergenerating group. But the effects of changes of activities 
within the intergenerating group, and not depending on changes in 
the environment, are not all covered by autonomic selection. We 
must also consider the autonomic forms of ‘tsolation, election, and 
partition, for they are all of importance in segregating and molding 
the types of allogamic organisms. 
Autonomic isolation includes both endonomic isolation, produced 
by industrial, chronal, and migrational isolation, and reflexive isola- 
tion, produced by sexual and social instincts, by impregnational 
incompatibilities, and by institutional requirements. Itisin contrast 
with heteronomic isolation, which is determined by conditions outside 
