Lately, the men of sense and science have secured allies who have brought to their cause what most it lacked, a little fundamental thought. Those able and honest people, the Cambridge rationalists, headed by Mr. G.E. Moore, to whose _Principia Ethica_ I owe so much, are, of course, profoundly religious and live by a passionate faith in the absolute value of certain states of mind; also they have fallen in love with the conclusions and methods of science. Being extremely intelligent, they perceive, however, that empirical arguments can avail nothing for or against a metaphysical theory, and that ultimately all the conclusions of science are based on a logic that precedes experience. Also they perceive that emotions are just as real as sensations. They find themselves confronted, therefore, by this difficulty; if someone steps forward to say that he has a direct, disinterested, _a priori_, conviction of the goodness of his emotions towards the Mass, he puts himself in the same position as Mr. Moore, who feels a similar conviction about the goodness of his towards the Truth. If Mr. Moore is to infer the goodness of one state of mind from his feelings, why should not someone else infer the goodness of another from his? The Cambridge rationalists have a short way with such dissenters. They simply assure them that they do not feel what they say they feel. Some of them have begun to apply their cogent methods to aesthetics; and when we tell them what we feel for pure form they assure us that, in fact, we feel nothing of the sort. This argument, however, has always struck me as lacking in subtlety. Much as he dislikes mentioning the fact or hearing it mentioned, the common man of science recognises no other end in life than protracted and agreeable existence. That is where he joins issue with the religious; it is also his excuse for being a eugenist. He declines to believe in any reality other than that of the physical universe. On that reality he insists dogmatically.[7] Man, he says, is an animal who, like other animals, desires to live; he is provided with senses, and these, like other animals, he seeks to gratify: in these facts he bids us find an explanation of all human aspiration. Man wants to live and he wants to have a good time; to compass these ends he has devised an elaborate machinery. All emotion, says the common man of science, must ultimately be traced to the senses. All moral, religious and aesthetic emotions are derived from physical needs, just as political ideas are based on that gregarious instinct which is simply the result of a desire to live long and to live in comfort. We obey the by-law that forbids us to ride a bicycle on the footpath, because we see that, in the long run, such a law is conducive to continued and agreeable existence, and for very similar reasons, says the man of science, we approve of magnanimous characters and sublime works of art.