(M144) Thus in primitive society the rules of ceremonial purity observed by divine kings, chiefs, and priests agree in many respects with the rules observed by homicides, mourners, women in childbed, girls at puberty, hunters and fishermen, and so on. To us these various classes of persons appear to differ totally in character and condition; some of them we should call holy, others we might pronounce unclean and polluted. But the savage makes no such moral distinction between them; the conceptions of holiness and pollution are not yet differentiated in his mind. To him the common feature of all these persons is that they are dangerous and in danger, and the danger in which they stand and to which they expose others is what we should call spiritual or ghostly, and therefore imaginary. The danger, however, is not less real because it is imaginary; imagination acts upon man as really as does gravitation, and may kill him as certainly as a dose of prussic acid. To seclude these persons from the rest of the world so that the dreaded spiritual danger shall neither reach them, nor spread from them, is the object of the taboos which they have to observe. These taboos act, so to say, as electrical insulators to preserve the spiritual force with which these persons are charged from suffering or inflicting harm by contact with the outer world.(701) To the illustrations of these general principles which have been already given I shall now add some more, drawing my examples, first, from the class of tabooed things, and, second, from the class of tabooed words; for in the opinion of the savage both things and words may, like persons, be charged or electrified, either temporarily or permanently, with the mysterious virtue of taboo, and may therefore require to be banished for a longer or shorter time from the familiar usage of common life. And the examples will be chosen with special reference to those sacred chiefs, kings and priests, who, more than anybody else, live fenced about by taboo as by a wall. Tabooed things will be illustrated in the present chapter, and tabooed words in the next. § 2. Iron tabooed.