It is not necessary to go over all this ground again. We have already examined it with sufficient care in connection with the first answer which we gave to the up-to-date youth who wanted to know why he shouldn't follow his every inclination. The various examples which we cited to illustrate the significance of reason and experience are enough to establish the point we are now making. As far as the material things of this world are concerned, and the material needs of the individual, the intellect is generally and properly acknowledged as the sovereign master. The rule of reason in private life; and the rule of science in civilization have become more and more the accepted standards of the world in which we live. If an instinct or a desire is unreasonable, it should not be allowed to prevail; if a tradition or a convention of the past is unscientific, it should be discarded and ridiculed as something out-of-date. That is the conclusion which advanced intellects have reached through scientific methods of enlightenment; it is the message they have been communicating, the example which they have been setting, until the wide-spread results are becoming increasingly apparent among all classes and in nearly all places, where modern science and civilization have penetrated. It ought not to be very difficult for any one to recognize and understand why the methods of science and the rule of reason occupy such a dominant place in public estimation as they undoubtedly do to-day. The only natural question is why they have not always, in by-gone generations, occupied just as high a place. The answer to this question is very simple, though some people's attention may not have been called to it. The scientific method of investigation, as we know it to-day, is a comparatively recent product of the human intellect. There was no science of any such kind when Homer wrote the Iliad, or when the Christian religion was founded, or when Leonardo da Vinci painted the Mona Lisa and Shakespeare wrote his masterpieces. Even at the time our great American republic was put into operation, modern science was still in its swaddling clothes. It is only in the last two generations that it may be said to have reached its true form and begun turning out in rapid succession the multitude of discoveries and inventions which have had such an immense effect in the daily life of civilization. It also takes a certain amount of time for great changes to permeate, and become absorbed by masses of people, so that it should not seem strange if many of the indirect results have only begun to be noticeable within the past few years. And now if we look about and pause to reflect on these triumphs of modern science, as they affect the life and ideas and feelings of the average individual, a very curious and somewhat startling question is liable to suggest itself.