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embryo gradually increase, we have a steady 

 and continued process of evolution, to which 

 must succeed in due time a process of revolu- 

 tion more or less prolonged, represented, for 

 example, by the separation of the whole 

 crystal from the mineral mass which surrounds 

 it, or by certain revolutionary phases of 

 vegetable or animal life, as, for example, the 

 moment of sexual reproduction. There can 

 equally take place in it a period of revolt, that 

 is to say of associated personal violence as is 

 often enough found with animal species that 

 live in a society ; there can also be found in 

 it isolated personal violence, as in the struggles 

 for the conquest of food or for the female with 

 animals of the same species. 



These same processes are found in the human 

 world. By evolution, we must understand the 

 daily change almost imperceptible but con- 

 tinuous and inevitable ; by revolution, the 

 critical and decisive moment, more or less 

 prolonged, of an evolution which has reached 

 its climax ; by revolt, the partially collective 

 violence which breaks forth on the occasion 

 of such or such particular circumstance, at a 

 given point or moment ; by individual violence 

 the action of an individual against one or more 

 other individuals. This may be the effect of 

 the explosion of a fanatical passion or of 

 criminal instincts, or the manifestation of a 

 defect of mental equilibrium, connected with 

 the ideas most in vogue at a given political 

 or religious period. 



We must first observe that whilst revolution 

 and evolution arise from social physiology, 



