It is supposed by many of those outside the Church that there is a distinct incompatibility between the state of mind which accepts things on faith and that other intellectual attitude which leads man to doubt about his knowledge and consequently to inquire. This doubting frame of mind, which is readily recognized to be absolutely necessary for the proper pursuit of experimental science, is supposed quite to preclude the idea of the peaceful settlement of the doubts that assail men's minds as to the significance of life, of the relation of man to man and to his Creator, and the hereafter, which comes {282} with the acceptance of what revelation has to say on these subjects. Somehow, it is assumed by many people that there is something mutually and essentially repellent in these two forms of assent. If a man is ready to accept certain propositions on authority and without being able to understand them, and still more, if he accept them, realizing that he cannot understand them, it is considered to be impossible for him to be able to assume such a mental attitude towards science as would make him an original investigator. It is almost needless to say to anyone who knows anything about the history of modern science--even nineteenth century science, that there is absolutely no foundation for this prejudice. Most of our greatest investigators even in nineteenth century science have been faithful believers not only in the ordinary religious truths, in a Providence, in a hereafter, and in this life as a preparation for another, but also in the great mysteries of revelation. I have shown this amply even with regard to what is usually considered so unorthodox a science as medicine, in my volume on the Makers of Modern Medicine. Most of the men who did the great original work in last century medicine were Catholics. The same thing is true for electricity, for example. All the men after whom modes and units of electricity are named--Galvani, Volta, Coulomb, Ampere, Ohm--were not only members of the Church, but what would be even called devout Catholics.