It is not the aim of the present writer to produce a Science of Religion, or even to speculate on the possibility of such a science being ultimately elabo rated when all the facts are fully known. He has set himself a more prosaic and less ambitious task that, namely, of collecting materials which may serve as a portion of the data, when the time comes, if it ever comes, for the construction of the science in question. A building cannot be erected without materials; a true science cannot be constructed with out ample data.