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I must begin what I have to say with a warning and an apology. I must warn you that the present essay makes no pretence to be an adequate treatment of some compact and limited theme; but rather resembles those wandering trains of thought, where we allow ourselves the luxury of putting wide-ranging questions, to which our ignorance forbids any confident reply. I apologise for adopting a course which thus departs in some measure from familiar precedent. I admit its perils. But it is just possible that when a subject, or group of subjects, is of great inherent interest, even a tentative, and interrogative, treatment of it may be worth attempting.