There is every reason to suppose that a very considerable period elapsed before any progress was made in advance of the ludicrous, but at length by those who appreciated it strongly, and saw it in things in which it did not appear to others, humorous devices were invented from a growing desire to multiply the occasions for enjoyment. Observation and our power of imitation provided the means, and men of humour employed themselves in reproducing some ludicrous situations; and thus, instead of things derided being as previously wholly separate from those who derided them, a man could laugh, and yet be the cause of laughter to others. This discovery was soon improved upon, and by aid of imagination and memory, as opportunities offered, certain connections and appearances were represented under a great variety of forms. As the mind enlarged, the exciting causes of laughter were not mainly physical or emotional, but assumed a higher and more rational character. At the period at which we have now arrived, we find humour dawning through various channels. We have traced approximations towards it in proverbs and fables, and, in a coarse form, in practical jokes; and as from historical evidences we are ready to admit that civilization had an Eastern origin, so we shall feel little difficulty in assigning Greece as the birthplace of humour. A greater activity of mind now begins to prevail, reflection has gradually given distinctness to emotion, and the ludicrous is not only recognised as a source of pleasure, but intentionally represented in literature. Before the time of AEsop, though not perhaps of his fables, Homer related a few laughable occurrences of so simple a character as to require little ingenuity. In this respect he is not much better than a man who recounts some absurd incident he has witnessed without adding sufficient to it to show that he has a humorous imagination. His mirth, except when merely that of pleasure, is of the old hostile character. In Iliad, xi, 378, Paris, having hit Diomed, from behind a pillar with an arrow in the foot, springs forth from his concealment and laughs at him, saying he wished he had killed him. In Iliad, xxi, 407, where the gods descend into the battle, Minerva laughs at Mars when she has struck him with a huge stone so that he fell, his hair was draggled in the dust, and his armour clanged around him. In the Odyssey, Ulysses speaks of his heart laughing within him after he had put out Polyphemus' eye with a burning stick without being discovered. And in Book xviii, Ulysses strikes Irus under the ear and breaks his head, so that blood pours from his mouth, and he falls gnashing and struggling on the ground, at which, we are told, the suitors "die with laughter."