+195+. The occasions for purification are numerous, including all contacts or possibilities of contact with dangerous (sacred) things, and thus often coinciding with taboo conceptions.[360] All acts connected with procreation and birth; contact with a corpse, or with a sacred person or thing, or with an object belonging to a sacred person; return from a journey (in the course of which the traveler may have been exposed to some injurious supernatural influence)[361]--such things as these call for cleansing. Inanimate objects also, especially such as are connected with religious worship (altars, vessels, and instruments), require purification; these are thought of originally as having souls, and as incurring defilement by the transmission of neighboring impurities. A moral conception may seem to be involved in the requirement of purification after the committal of a murder; certainly, in the more advanced stages of society, the feeling in this case is moral, but it is doubtful whether in earlier stages anything more is involved than the recognition of ritual defilement by contact with blood; homicide, as a social crime, is dealt with by the civil law, and is generally excluded from the benefits of acts of ritual atonement,[362] and so also all violations of tribal law. +196+. The religious preparation for the performance of a sacred act usually concerns official persons (see below, under _consecration_, § 202), but sometimes involves the purification of others. The largest act of purification is that which includes a whole community or people;[363] the social mass is then regarded as a unit, and there is no reason, according to early thought, why such a mass should not, by a ceremony, be freed from all ritual disabilities, the idea of moral purification being, of course, absent or latent. Finally, ritual purification is sometimes a preliminary to pleasing and influencing the deity, who, as the most sacred and most dangerous object, must be approached with the greatest precautions.[364]