However this may be, we cannot close our eyes to the interest which attaches to the first dawnings of art in the world. Nor is this interest confined altogether to its æsthetic side--the mere beauty and value of art itself--great though this be. Not only does drawing share that mysterious power of imparting intense pleasure which belongs to every form of art, but it was likewise, after human speech, the first discovered means of conveying an idea from one man to another. As we shall come to see in a later chapter, the invention of drawing bore with it the seeds of the invention of writing, the greatest step forward, in material things at any rate, that man has ever made. There is one other fact to be mentioned, and then the information which our cave discoveries can give us concerning the life of man in those days is pretty nearly exhausted. Traces of fires have been found in several caves, so that there can be no doubt that man had made this important discovery, the discovery of fire, also. It seems to us impossible to imagine a time when men could have lived upon the earth without this all-useful element, when they must have devoured their food uncooked, and only sheltered themselves from the cold by the thickness of their clothing, or at night by huddling together in close underground houses. We have certainly no proof that man’s existence was ever of such a sort as this; but yet it is clear that the art of making fires is one not discoverable at first sight. How long man took to find out that method of ignition by friction of two sticks--the method employed in different forms by all the less cultivated nations spread over the globe, and one which we may therefore fairly take to be the most primitive and natural--we shall never know. We have only the negative evidence that he had discovered it at that primæval time when he began to leave his remains within the caves. Thus have we completed the catalogue of facts upon which we may build up for ourselves some representation of the life of man in the earliest ages of his existence upon earth. It must be confessed that they are meagre enough. We should like some further facts which would help us to picture the man himself, his size, his appearance, what race he most resembled of any of those which now inhabit our globe. Unfortunately we have little that can assist us here. Human remains have been found--on one or two occasions a skeleton in tolerably complete preservation--but not yet in sufficient numbers to allow us to draw any certain conclusions from them, or even to hazard any very probable conjecture. [Sidenote: Human remains.]