They made their way to Nanking, the imperial capital, and there handed over their treasure of gems.
The emperor was much pleased and showed them to the wise man. He said: "Of the three great pearls one is a divine wishing-pearl of the third class, and two are black dragon-pearls of medium quality. Of the seven smaller pearls two are serpent-pearls, and five are mussel-pearls. The remaining pearls are in part sea-crane pearls, in part snail and oyster-pearls. They do not approach the great pearls in value, and yet few will be found to equal them on earth."
The emperor also showed them to all his servants. They, however, thought the wise man's words all talk, and did not believe what he said.
Then the wise man said: "The radiance of wishing-pearls of the first class is visible for forty miles, that of the second class for twenty miles, and that of the third for ten miles. As far as their radiance carries, neither wind nor rain, thunder nor lightning, water, fire nor weapons may reach. The pearls of the black dragon are nine-colored and glow by night. Within the circle of their light the poison of serpents and worms is powerless. The serpent-pearls are seven-colored, the mussel-pearls five-colored. Both shine by night. Those most free from spots are the best. They grow within the mussel, and increase and decrease in size as the moon waxes and wanes."
Some one asked how the serpent- and sea-crane pearls could be told apart, and the wise man answered: "The animals themselves recognize them."
Then the emperor selected a serpent-pearl and a sea-crane pearl, put them together with a whole bushel of ordinary pearls, and poured the lot out in the courtyard. Then a large yellow serpent and a black crane were fetched and placed among the pearls. At once the
