The disciples of Ts'ian Chow were all eminent scholars of famous attainments, but they were all sceptical as to the veracity of the adventures of King Müh, and say that in looking over history they are convinced of their fallacy. Sz Ma Tseen also, in writing the preface to the "Records of Ta Wan," says that when Chang Ch'ien went on his mission to Ta Hsia, he traversed the whole length of the Huang Ho up to its very source, but never came across the Küen Lun mountain. Moreover, Sz Ma Tsëen in his own history also says, in referring to the "Book of Wonders by Land and Sea," that, "As to the wonders described in that work, I, for my part, dare not vouch for their truth." In the face, therefore, of all these authorities, is it not a hard task for me to prove the contrary? If the "Bamboo Annals" of a thousand years ago be not taken at the present day as a truthful record of the past, then, indeed, most of the narratives contained in the "Book of Wonders by Land and Sea" must be false. Now, Tung Fang Shun knew of Pe Fang; Lin Tsz Chen proved satisfactorily the existence of Tao Chea by a corpse from that kingdom. Wang Ch'i had an interview with men having two distinct faces on their heads, and a man from the sea coast picked up a dress having two very long sleeves. In carefully studying, therefore, these books, I am convinced that their stories mainly coincide with the tales in the "Book of Wonders by Land and Sea." Behold these evidences then, ye who doubt, and place some credence in the narrations contained in this book. The Sage King made exhaustive researches into these wondrous beings, and then drew their images. It is indeed impossible to hide the existence of these wonders! The "Book of Wonders by Land and Sea" was compiled seven dynasties ago (up to the Tsin dynasty), a space of 3,000 years. During the Han dynasty this book received the closest attention, and was elucidated for the benefit of its readers; but shortly after it again fell into neglect. Moreover, since then, the names of some mountains and rivers have undergone changes. At the present day, teachers and expounders are unable to explain these wonders, and hence through disuse their reasons given at an earlier age have almost sunk into oblivion. Alas, for the loss of Reason! Fearing, therefore, that it will be entirely lost, I have written the accompanying work, making lucid the points that are obscure, and erasing those that are useless; pointing out what would not be noticeable, and explaining the parts that are deep. I shall endeavour to reclaim what has almost become obsolete, that it may stand for thousand of ages, and the wonders herein recorded shall not, from the present day, be lost. Thus the works of the Emperor Yü of the Hsia dynasty will not be lost in the future, and the records of the Barren Wastes beyond the boundaries of this Empire will be transmitted to posterity. Will not this be a laudable object?