Our third point is more difficult to explain, though it will appear not merely obvious, but self-evident, if I succeed in explaining it. It will facilitate the work of explanation, if you will for the moment suppose--without considering whether the supposition is true or not--that there was a time when no one had heard that there was such a thing as magic. Let us further suppose that at that time man had observed such facts as that heat produces warmth, that the young of animals and man resemble their parents: in a word, that he had attained more or less consciously to the idea, as a matter of observation, that like produces like, and as a matter of practice that like may be produced by like. Having attained to that practical idea, he will of {73} course work it not only for all that it is worth, but for more. That is indeed the only way he has of finding out how much it is good for; and it is only repeated failure which will convince him that here at length he has reached the limit, that in this particular point things do not realise his expectations, that in this instance his anticipation of nature has been "too previous." Until that fact has been hammered into him, he will go on expecting and believing that in this instance also like will produce like, when he sets it to work; and he will be perfectly convinced that he is employing the natural and reasonable means for attaining his end. As a matter of fact, however, as we with our superior knowledge can see, in the first place those means never can produce the desired effect; and next, the idea that they can, as it withers and before it finally falls to the ground, will change its colour and assume the hue of magic. Thus the idea that by whistling you can produce a wind is at first as natural and as purely rational as the idea that you can produce warmth by means of fire. There is nothing magical in either. Both are matter-of-fact applications of the practical maxim that like produces like. {74} That, then, is the point which I have been wishing to make, the third of the three points from which I wish to start. There are three ways of looking at identically the same thing, _e.g._ whistling to produce a wind. First, we may regard it, and I suggest that it was in the beginning regarded, as an application, having nothing to distinguish it from any other application, of the general maxim that like produces like. The idea that eating the flesh of deer makes a man timid, or that if you wish to be strong and bold you should eat tiger, is, in this stage of thought, no more magical than is the idea of drinking water because you are dry.