The life of the Australian societies passes alternately through two distinct phases .
Sometimes the population is broken up into little groups who wander about independently of one another, These two phases are contrasted with each other in the sharpest way. In the first, economic activity is the preponderating one, and it is generally of a very mediocre intensity. Gathering the grains or herbs that are necessary for food, or hunting and fishing are not occupations to awaken very lively passions. The dispersed condition in which the society finds itself results in making its life uniform , languishing and dull. But when a corrobbori takes place, everything changes. Since the emotional and passional faculties of the primitive are only imperfectly placed under the control of his reason and will, he easily loses control of himself. Any event of some importance puts him quite outside himself. Does he receive good news ? There are at once transports of enthusiasm. In the contrary conditions, he is to be seen running here and there like a madman, giving himself up to all sorts of immoderate movements, crying, shrieking, rolling in the dust, throwing it in every direction, biting himself, brandishing his arms in a furious manner, etc.