The material contained in this source would fill a number of volumes; we have restricted ourselves to a certain number of more or less typical illustrations chosen from a great mass. * * * * * More than a hundred and fifty years ago de Cahusac wrote in the Preface to his _Historical Treatise on Dancing_: “J’ai traité assez sérieusement un sujet qu’on ne regardera peut-être que comme très-futile.” The present writer hopes and believes that his effort will not be regarded as “très-futile”; for we in these days have come to realize more fully than was possible in the eighteenth century the significance of the well-known words of Terence: _Homo sum; humani nihil a me alienum puto._ CHAPTER II THE ORIGIN AND PURPOSES OF THE SACRED DANCE I In his thoughtful and very suggestive volume, _The Threshold of Religion_, Marett makes the assumption that an inductive study of the ideas and customs of savagery will show, firstly, that an awareness of a fundamental aspect of life and of the world, which aspect I shall provisionally term “supernatural,” is so general as to be typical, and, secondly, that such an awareness is no less generally bound up with a specific group of vital reactions (p. 124). Every student of such ideas and customs must know how thoroughly justified this assumption is. In studying the particular custom, and the ideas connected with it, with which we are here concerned, we find that this “awareness of the supernatural,” together with the “vital reactions,” are, at any rate in the earlier stages of its history, invariably present. That much, at all events, we have to go upon in seeking a theory as to the origin of the sacred dance. To account for its origin is, however, difficult; that is fully realized; and the present writer would desire to lay stress on the fact that as in seeking such origin he is largely in the domain of speculation and theory, nothing is further from his mind than to be dogmatic. The whole subject of the sacred dance has been so little dealt with excepting as a mere rite, that one is to a great extent on new ground; one must, therefore, be quite prepared to be convicted of fallacies.