left the old bed toward the ocean dry. Much of the later city as we now found it had been built over that former bed. The Old Ones, understanding what had happened, and exercising their always keen artistic sense, had carved into ornate pylons those headlands of the foothills where the great stream began its descent into eternal darkness.
This river, once crossed by scores of noble stone bridges, was plainly the one whose extinct course we had seen in our aeroplane survey. Its position in different carvings of the city helped us to orient ourselves to the scene as it had been at various stages of the region’s age-long, aeon-dead history, so that we were able to sketch a hasty but careful map of the salient features — squares, important buildings, and the like — for guidance in further explorations. We could soon reconstruct in fancy the whole stupendous thing as it was a million or ten million or fifty million years ago, for the sculptures told us exactly what the buildings and mountains and squares and suburbs and landscape setting and luxuriant Tertiary vegetation had looked like. It must have had a marvelous and mystic beauty, and as I thought of it I almost forgot the clammy sense of sinister oppression with which the city’s inhuman age and massiveness and deadness and remoteness and glacial twilight had choked and weighed on my spirit. Yet according to certain carvings the denizens of that city had themselves known the clutch of oppressive terror; for there was a somber and recurrent type of scene in which the Old Ones were shown in the act of recoiling affrightedly from some object — never allowed to appear in the design — found in the great river and indicated as having been washed down through waving, vine-draped cycad forests from those horrible westward mountains.
It was only in the one late-built house with the decadent carvings that we obtained any foreshadowing of the final calamity leading to the city’s desertion. Undoubtedly there must have been many sculptures of the same age elsewhere, even allowing for the slackened energies and aspirations of a stressful and uncertain period; indeed, very certain evidence of the existence of others came to us shortly afterward. But this was the first and only set we directly encountered. We meant to look farther later on; but as I have said, immediate conditions dictated another present objective. There would, though, have been a limit — for after all hope of a long future occupancy of the place had perished among the Old Ones, there could not but have been a complete cessation of mural decoration. The ultimate blow, of course, was the coming of the great cold which once held most of the earth in thrall, and which has never departed from the ill-fated poles — the great cold that, at the world’s other extremity, put an end to the fabled lands of Lomar and Hyperborea.
Just when this tendency began in the antarctic it would be hard to say in terms of exact years. Nowadays we set the beginning of the general glacial periods at a distance of about five hundred thousand years from the present, but at the poles the terrible scourge must have commenced much earlier. All quantitative estimates are partly guesswork, but it is quite likely that the decadent sculptures were made considerably less than a million years ago, and that the actual desertion of the city was complete long before the conventional opening of the Pleistocene — five hundred thousand years ago — as reckoned in terms of the earth’s whole surface.
In the decadent sculptures there were signs of thinner vegetation everywhere, and of a decreased country life on the part of the Old Ones. Heating devices where shown in the house, and winter travelers were represented as muffled in protective fabrics. Then we saw a series of cartouches — the continuous band arrangement being frequently interrupted in these late carvings — depicting a constantly growing migration to the nearest refuges of greater warmth — some fleeing to cities under the sea off the far-away coast, and some clambering down through networks of limestone caverns in the hollow hills to the neighboring black abyss of subterrene waters.
In the end it seems to have been the neighboring abyss which received the greatest colonization. This was partly due, no doubt, to the traditional sacredness of this special region, but may have been more conclusively determined by the opportunities it gave for continuing the use of the great temples on the honeycombed mountains, and for retaining the vast land city as a place of summer residence and base of communication with various mines. The linkage of old and new abodes was made more effective by means of several gradings and improvements along the connecting routes, including the chiseling of numerous direct tunnels from the ancient metropolis to the black abyss — sharply down-pointing tunnels whose mouths we carefully drew, according to our most thoughtful estimates, on the guide map we were compiling. It was obvious that at least two of these tunnels lay within a reasonable exploring distance of where we were — both being on the mountainward edge of the city, one less than a quarter of a mile toward the ancient river course, and the other perhaps twice that distance in the opposite direction.
The abyss, it seems had shelving shores of dry land at certain places, but the Old Ones built their new city under water — no doubt because of its greater certainty of uniform warmth. The depth of the hidden sea appears to have been very great, so that the earth’s internal heat could ensure its habitability for an indefinite period. The beings seem to have had no trouble in adapting themselves to part-time — and eventually, of course, whole-time — residence under water, since they had never allowed their gill systems to atrophy. There were many sculptures which showed how they had always frequently visited their submarine kinsfolk elsewhere, and how they had habitually bathed on the deep bottom of their great river. The darkness of inner earth could likewise have been no deterrent to a race accustomed to long antarctic nights.
Decadent though their style undoubtedly was, these latest carvings had a truly epic quality where they told of the building of the new city in the cavern sea. The Old Ones had gone about it scientifically — quarrying insoluble rocks from the hearth of the honeycombed mountains, and employing expert workers from the nearest submarine city to perform the construction according to the best methods. These workers brought with them all that was necessary to establish the new venture — Shoggoth tissue from which to breed stone lifters and subsequent beasts of burden for the cavern city, and other protoplasmic matter to mold into phosphorescent organisms for lighting purposes.
At last a mighty metropolis rose on the bottom of that Stygian sea, its architecture much like that of the city above, and its workmanship displaying relatively little decadence because of the precise mathematical element inherent in building operations. The newly bred Shoggoths grew to enormous size and singular intelligence, and were represented as taking and executing orders with marvelous quickness. They seemed to converse with the Old Ones by mimicking their voices — a sort of musical piping over a wide range, if poor Lake’s dissection had indicated aright — and to work more from spoken commands than from hypnotic suggestions as in earlier times. They were, however, kept in admirable control. The phosphorescent organisms supplied light with vast effectiveness, and doubtless atoned for the loss of the familiar auroras of the outer-world night.
Art and decoration were pursued, though of course with a certain decadence. The Old Ones seemed to realize this falling off themselves, and in many cases anticipated the policy of Constantine the Great by transplanting especially fine blocks of ancient carving from their land city, just as the emperor, in a similar age of decline, stripped Greece and Asia of their finest art to give his new Byzantine capital greater splendors than its own people could create. That the transfer of sculptured blocks had not been more extensive was doubtless owing to the fact that the land city was not at first wholly abandoned. By the time total abandonment did occur — and it surely must have occurred before the polar Pleistocene was far advanced — the Old Ones had perhaps become satisfied with their decadent art — or had ceased to recognize the superior merit of the older carvings. At any rate, the aeon-silent ruins around us had certainly undergone no wholesale sculptural denudation, though all the best separate statues, like other movables, had been taken away.
The decadent cartouches and dadoes telling this story were, as I have said, the latest we could find in our limited search. They left us with a picture of the Old Ones shuttling back and forth betwixt the land city in summer and the sea-cavern city in winter, and sometimes trading with the sea-bottom cities off the antarctic coast. By this time the ultimate doom of the land city must have been recognized, for the sculptures showed many signs of the cold’s malign encroachments. Vegetation was declining, and the terrible snows of the winter no longer melted completely even in midsummer. The saurian live stock were nearly all dead, and the mammals