The very general enquiry which we are about to attempt naturally leaves out of account the differences in detail observable in primitive communities, even in those nearest to each other and most closely related. In a limited area, in a single small island, beliefs, customs and ceremonies vary more or less, just as dialect does, between one tribe and the next. In a fairly numerous group even, there are individuals who often display diversity of temperament and characteristics, if they can do so without too much danger. From time to time, as among ourselves, there are to be found natures inclined to criticism, less amenable to accepted conventions than the rest, even in some cases going as far as scepticism and unbelief. 1