In the light of these considerations, though the old perplexity of evil will still confront us, it will be seen that the claims of Catholic orthodoxy do nothing at all to add to it. If orthodoxy, however, admit so much good without itself, we may perhaps be inclined to ask what special good it claims within itself, and what possible motives can exist for either understanding or teaching it. But we might ask with exactly equal force, what is the good of true physical science, and why should we try to impress on the world its teachings? Such a question, we can at once see, is absurd. Because a large number of men know nothing of physical science, and are apparently not the worse for their ignorance, we do not for that reason think physical science worthless. We believe, on the whole, that a knowledge of the laws of matter, including those of our organisms and their environments, will steadily tend to better our lives, in so far as they are material. It will tend, for instance, to a better preservation of our health. But we do not for this reason deny that many individuals may preserve their health who are but very partially acquainted with the laws of it. Nor do we deny the value of a thorough study of astronomy and meteorology because a certain practical knowledge of the weather and of navigation may be attained without it. On the contrary, we hold that the fullest knowledge we can acquire on such matters it is our duty to acquire, and not acquire only, but as far as possible promulgate. It is true that the mass of men may never master such knowledge thoroughly; but what they do master of it