+181+. The marriage ceremonies mentioned above appear to be all social in their nature. Into them the supernatural is introduced in proportion as the conception of a divine control of society obtains.[335] On the other hand, those customs which are intended to ward off evil spirits or general evil influences from the married pair are religious or magical. +182+. Mr. Crawley[336] holds that all marriage ceremonies are essentially religious, as involving the conception of something strange and dangerous in the contact of men and women; they are intended, he thinks, to neutralize dangers by reversing taboos and by assimilating the two persons each to the other, the dangers in question being not merely distinctly sexual but those of contact in general. Though he carries his application of the principle of taboo too far, he has collected a large number of examples which illustrate the separation between the sexes in early society, and the taboos which hold in their social intercourse. The separation of the sexes in early times seems to have resulted largely from the difference in their occupations and the consequent isolation of each from the other. Possibly one result of this isolation was that each saw something strange and wonderful in the other; but it must be remembered that the taboo laws were made by men and are therefore directed particularly against women. The belief in the sacredness of life would act more particularly on the ideas concerning birth. +183+. Among many half-civilized peoples and generally in Christian communities marriage is regarded both as a religious ceremony and as a civil contract, and is controlled in the one case by the religious authorities, in the other case by the civil authorities. In Mohammedan communities marriage is simply a civil contract, but religious ceremonies are often connected with it.[337] CEREMONIES AT BIRTH +184+. It is possible that early man was so impressed by the fact of life and the wonderfulness of the birth of a human being that he included this latter fact in the sphere of the supernatural, and that the taboos connected with it arose from his dread of supernatural, dangerous influence.[338] Many of the ceremonies connected with the birth of a child may be explained easily as resulting from the natural care for mother and child. Both of these are, in the modern sense of the term, sacred; and even in very early times ordinary humane feeling would seek to protect them from injury.[339]