Thus the important binding faster in a community of insects probably falls under the notion of pure instinct, as here defined. For each individual insect is probably such an organism that the causal conditions which it inherits from the immediate past are adequate to determine its social actions. But reflex action plays its subordinate part. For the sense-perceptions of the insects have in certain fields of action assumed an automatic determination of the insects’ activities. Still more feebly, symbolically conditioned action intervenes for such situations when the sense-presentation provides a symbolically defined specification of the causal situation. But only active thought can save symbolically conditioned action from quickly relapsing into reflex action. The most successful examples of community life exist when pure instinct reigns supreme. These examples occur only in the inorganic world; among societies of active molecules forming rocks, planets, solar systems, star clusters.
The more developed type of living communities requires the successful emergence of sense-perception to delineate successfully causal efficacy in the external environment; and it also requires its relapse into a reflex suitable to the community. We
