The needs thus contemplated will not be met simply by collections of facts and catenæ of quotations. The facts and the quotations cannot be properly understood apart from their setting. If the right value is to be assigned to evidence of this kind, the evidence must be systematically grouped and scientifically treated. The starting point for such an historical inquiry into the doctrine of the Holy Eucharist as is here contemplated must necessarily be found in the institution of the Sacrament by