According to the theory advanced above, the writer believes that the most probable prototype of the dragon is the Brontosaurus of the Mesozoic age, although the present conception of the dragon may easily have sprung from such other prehistoric animals, as the plesiosaurus of the same period or the Iguanodon of the Cenozoic age. Skeletons of these giants of the saurian family and pictures of the reconstructed animals indicate a striking resemblance to the graceful creatures that dominate the art of China. The first appearance of the true dragon, according to the records of what is considered to be authentic Chinese history, occurred some forty-six centuries ago during the reign of Huang Ti, or Hsuan Yuan, the third of the five great rulers. We are told that after this personage had reigned one hundred and eleven years a large dragon appeared and took him to heaven upon his back. Since that day dragons have been seen in every dynasty and by hundreds of witnesses, as Chinese history abundantly attests. Dragon appearances were considered auspicious, and augured well for the affairs of state. In support of this belief, it is interesting to note that when the late President Yuan Shih-kai was trying to make himself emperor his friends made at least one attempt to unearth what were supposed to be the bones of a dragon. This was done in order that the superstitious among his countrymen might be led to feel that his desire to reëstablish the empire was according to the law of heaven. For centuries it was the custom for anyone who saw a dragon, either himself or through the magistrate of the district in which he lived, immediately to announce the fact to the emperor. In early days history was often counted from the appearance of a particular dragon. A popular fable relates that Yü Wang was able to end the great flood 2297 B.C. only after he had succeeded in capturing the dragon, who was said to be responsible for the deluge. The animal was chained in heavy irons and imprisoned, after which the flood subsided. Ever since that time all dragons, we are told, have trembled at the memory of the only man who ever conquered their kind. CHAPTER THREE THE VARIETIES OF DRAGONS