1. Science has furnished the key to those miracles which proceed particularly from the material element, either by explaining them, or in demonstrating the impossibility of them by the laws which rule matter. But the phenomena where the spiritual element is the preponderating force, not being explainable solely by the laws of matter, escape the investigations of scientists. That is why they have more than other facts the apparent character of marvels. It is then only in the laws which rule spiritual life one can find the key for the miracles of this category.