But the chief difference between these two sorts of totems is in the manner in which they are acquired. The collective totem is a part of the civil status of each individual: it is generally hereditary; in any case, it is birth which designates it, and the wish of men counts for nothing. Sometimes the child has the totem of his mother (Kamilaroi, Dieri, Urabunna, etc.); sometimes that of his father (Narrinyeri, Warramunga, etc.); sometimes the one predominating in the locality where his mother conceived (Arunta, Loritja). But, on the contrary, the individual totem is acquired by a deliberate act:[524] a whole series of ritual operations are necessary to determine it. The method generally employed by the Indians of North America is as follows. About the time of puberty, as the time for initiation approaches, the young man withdraws into a distant place, for example, into a forest. There, during a period varying from a few days to several years, he submits himself to all sorts of exhausting and unnatural exercises. He fasts, mortifies himself and inflicts various mutilations upon himself. Now he wanders about, uttering violent cries and veritable howls; now he lies extended, motionless and lamenting, upon the ground. Sometimes he dances, prays and invokes his ordinary divinities. At last, he thus gets himself into an extreme state of super-excitation, verging on delirium. When he has reached this paroxysm, his representations readily take on the character of hallucinations. "When," says Heckewelder, "a boy is on the eve of being initiated, he is submitted to an alternating régime of fasts and medical treatment; he abstains from all food and takes the most powerful and repugnant drugs: at times, he drinks intoxicating concoctions until his mind really wanders. Then he has, or thinks he has, visions and extraordinary dreams to which he was of course predisposed by all this training. He imagines himself flying through the air, advancing under the ground, jumping from one mountain-top to another across the valleys, and fighting and conquering giants and monsters."[525] If in these circumstances he sees, or, as amounts to the same thing, he thinks he sees, while dreaming or while awake, an animal appearing to him in an attitude seeming to show friendly intentions, then he imagines that he has discovered the patron he awaited.[526]