"It cannot be, surely it cannot be," said Professor Moissan at length. "But it is," said another member of the party. "Are these diamonds?" asked a third. "I cannot yet tell," replied the Professor. "They have the brilliancy of diamonds, but they may be something else." "Moon jewels," suggested a third. "And worth untold millions, whatever they are," remarked another. Jewels from the Moon. These magnificent crystals, some of which appeared to be almost flawless, varied in size from the dimensions of a hazelnut to geometrical solids several inches in diameter. We carefully selected as many as it was convenient to carry and placed them in the car for future examination. We had solved another long standing lunar problem and had, perhaps, opened up an inexhaustible mine of wealth which might eventually go far toward reimbursing the earth for the damage which it had suffered from the invasion of the Martians. On returning to Cape Heraclides we found that the other expeditions had arrived at the rendezvous ahead of us. Their members had wonderful stories to tell of what they had seen, but nothing caused quite so much astonishment as that which we had to tell and to show. The party which had gone to visit Plato and the lunar Alps brought back, however, information which, in a scientific sense, was no less interesting than what we had been able to gather. They had found within this curious ring of Plato, which is a circle of mountains sixty miles in diameter, enclosing a level plain remarkably smooth over most of its surface, unmistakable evidences of former inhabitation. A gigantic city had evidently at one time existed near the centre of this great plain. The outlines of its walls and the foundation marks of some of its immense buildings were plainly made out, and elaborate plans of this vanished capital of the moon were prepared by several members of the party. More Evidences of Habitation. One of them was fortunate enough to discover an even more precious relic of the ancient lunarians. It was a piece of petrified skullbone, representing but a small portion of the head to which it had belonged, but yet sufficient to enable the anthropologists, who immediately fell to examining it, to draw ideal representations of the head as it must have been in life--the head of a giant of enormous size, which, if it had possessed a highly organized brain, of proportionate magnitude, must have given to its possessor intellectual powers immensely greater than any of the descendants of Adam have ever been endowed with. Giants in Size. Indeed, one of the professors was certain that some little concretions found on the interior of the piece of skull were petrified portions of the brain matter itself, and he set to work with the microscope to examine its organic quality.