The sombre obscurity well befits these sepulchral dwellings, and the dull sound of the deadened gongs struck by the guardians makes the vaults reverberate in a singular and impressive way. Behind the memorial temple rises an artificial mound about fifty feet high, access to the top of which is given by a rising arched passage built of white marble. On the top of the mound is an imposing marble structure consisting of a double arch, beneath which is the imperial tablet, a large slab, upon which is carved a dragon standing on the back of a gigantic tortoise. The remains of the emperor are buried somewhere within this mound, though the exact spot is not known: this precaution, it is said, was taken to preserve the remains from being desecrated in a search for the treasures which were buried with him, while the persons who performed this last office were killed upon the spot, in order further to preserve the secret. [Illustration: CHAPEL OF THE SUMMER PALACE.] From this gigantic effort to preserve the memory of the dead our party hastened to the Great Wall, an equally immense work to preserve the living from the incursions of their neighboring enemies. Perhaps nowhere in the world are to be found in such close proximity two such striking evidences of the waste of human labor when undirected by scientific knowledge. The wall is to-day, and was from the first, as worthless for the purpose it was intended to serve as the temples are for obtaining immortality for the bodies they enclose. Leaving the town of Nang-Kao, the party soon found themselves at the entrance of the pass of the same name, and during the six leagues which separated them from the wall the spectacle kept increasing in grandeur. The gorge at first was savage and sombre, shut in closely by the steep mountain-sides. Soon the first support of the Great Wall appeared in a chain of walls, with battlements and towers, built over the principal mountain-chain, and as far as the eye could reach following all the peaks. The effect of this wall is most striking. Like some enormous serpent it stretches away in the distance, climbing rocks which appear impracticable, and which would be so without its aid. The count was convinced that it would be as difficult to climb it for the purpose of defending it as it would be to do so in order to attack it. This first support of the wall is in itself a giant work.