[Sidenote: Appearance of the dead to the living, especially in dreams.]
With regard to the ghosts on earth, some tribes of South-eastern Australia believe that they can be seen by the living, can partake of food, and can warm themselves at a fire. It is especially the graves, where their mouldering bodies are deposited, that these restless spirits are supposed to haunt; it is there that they shew themselves either to people generally or to such as have the second sight.[184] But it is most commonly in dreams that they appear to the living and hold communication with them. Often these communications are believed to be helpful. Thus the tribes of the Wotjobaluk nation thought that the ghosts of their dead relations could visit them in sleep to protect them. A Mukjarawaint man told Dr. Howitt that his father came to him in a dream and warned him to beware or he would be killed. This, the man believed, was the saving of his life; for he afterwards came to the place which he had seen in his dream; whereupon, instead of going on, he turned back, so that his enemies, who might have been waiting for him there, did not catch him.[185] Another man informed Dr. Howitt that his dead uncle appeared to him in sleep and taught him charms against sickness and other evils; and the Chepara tribe similarly believed that male ancestors visited sleepers and imparted to them charms to avert evil magic.[186]
[Sidenote: Savage faith in the truth of dreams. Association of the stars with the souls of the dead.]
Such notions follow naturally from the savage theory of dreams. Almost all savages appear to believe firmly in the truth of dreams; they fail to draw the distinction, which to us seems obvious, between the imaginary creations of the mind in sleep and the waking realities of the physical world. Whatever they dream of must, they think, be actually existing; for have they not seen it with their own eyes? To argue that the visions of sleep have no real existence is, therefore, in their opinion, to argue against the plain evidence of their senses; and they naturally treat such exaggerated scepticism with incredulity and contempt. Hence when they dream of their dead friends and relations they necessarily conclude that these persons are still alive somewhere and somehow, though they do not commonly appear by daylight to people in their waking hours. Unquestionably this savage faith in the reality of dreams has been one of the principal sources of the widespread, almost universal, belief in the survival of the human soul after death. It explains why ghosts are supposed to appear rather by night than by day, since it is chiefly by night that men sleep and dream dreams. Perhaps it may also partly account for the association of the stars with the souls of the dead. For if the dead appear to the living mainly in the hours of darkness, it seems not unnatural to imagine that the bright points of light which then bespangle the canopy of heaven are either the souls of the departed or fires kindled by them in their home aloft. For example, the Central Australian aborigines commonly suppose the stars to be the camp-fires of natives who live on the banks of the great river which we civilised men, by a survival of primitive mythology, call the Milky Way. However, these rude savages, we are told, as a general rule "appear to pay very little attention to the stars in detail, probably because they enter very little into anything which is connected with their daily life, and more especially with their food supply."[187] The same observation which Messrs. Spencer and Gillen here make as to the natives of Central Australia might be applied to most savages who have remained in the purely hunting stage of social development. Such men are not much addicted to star-gazing, since the stars have little or nothing to tell them that they wish to know. It is not till people have betaken themselves to sowing and reaping crops that they begin to scan the heavens more carefully in order to determine the season of sowing by observation of the great celestial time-keepers, the rising and setting of certain constellations, above all, apparently, of the Pleiades.[188] In short, the rise of agriculture favours the rise of astronomy.